Skill: write-like-james @ b0fa825 · the build: write-lesson, write-mcqs, write-video-script, review-lesson (two blind reads and a re-read), review-figures, review-accuracy @ b0fa825
Topic 16 "When a change makes a new material" — your read (2 October 2026)
Skim first
The lessons in teaching order, each with its one rule sentence; then the intro script; then the question types. The review page follows.
The lessons and their rules
| Lesson | Atom | Rule sentence |
|---|---|---|
| L01 The same water, as a solid, a liquid or a gas | MAT4-024 | Ice, water and water vapor are the same stuff: water. Three states: solid, liquid and gas. Each state does its own jobs. |
| L02 New material or the same material? | MAT4-060 | Some changes make a new material. Other changes keep the same material. New state, new shape or mixed in: the same material. |
| L03 The clue that a new material formed | MAT4-061 | The clue is a changed property that will not change back. A new color, a new smell, bubbles. Or a new kind of solid. |
The intro script (117 words, about 58 s)
Here's Miss Mendez's class, camping at a state park. As the sun sets, she strikes a match and lights the campfire. The match burns down to a black, crumbly stick, and smoke drifts up. Frankie opens the cooler. The ice she packed this morning has turned into cold water. Gabriel says the match and the ice both changed. So are those two changes the same kind, or two different kinds? To find out, we will look at ice, water and water vapor, at changes that make a new material or keep the same material, and at the clue that tells them apart. Okay, so are you ready to find out when a change makes a new material?
The question types (from TYPES_G4T16.md)
- Type 1: A use of water → the state it relies on; fixed set solid water / liquid water / water vapor / a material that is not water.
- Type 2: Pick the one use (of four) that needs a named state.
- Type 3: After a change, what is the thing now (the ice, the water in the air, the melted ice cream, the flakes); four accounts a child gives, the key never the longest.
- Type 4: Which kind of change is this? Fixed four-way set: a new material · the same material in a new state · in a new shape · mixed into something.
- Type 5: Pick the one change of four that makes a new material (or keeps the same material).
- Type 6: A claim is fixed as wrong in the stem; pick the sentence that shows it (reason form, never verdict + reason; every distractor a real account; the key no longer than the distractors).
- Type 7: What is the clue that a new material formed? Two fixed sets: CLUE4 (a new color / a new smell / bubbles / a new kind of solid) on PP-35, PP-37 and PP-53; CLUE4_NO (a new color / a new smell / bubbles / There is no clue.) on PP-33, 34, 36, 38, so "There is no clue." is offered four times and keyed twice.
- Type 8: Which observation (of four true ones) shows a new material formed?
- Type 9: Type the word: the new material's name from its properties (rust, ash), or the kind of clue (bubbles, color, smell).
- Type 10: Multi-select: every observation that is a clue.
Three lessons: ice, water and water vapour are the same stuff, water, in three states, and each state does its own jobs; some changes turn a material into a new material (a match burns, a nail rusts, batter bakes) and others keep the same material (ice melts, paper is cut, sugar dissolves); the clue that a new material formed is a changed property that will not change back (a new colour, a new smell, bubbles, or a new kind of solid). Every key agreed by two cold readers, every changed item re-read by a third, and the three reviews are applied. Pictures are placeholders until you answer.
The questions the author put to you (built as recommended)
1. Does L01 keep its video, or ship as an article only?
L01 says that ice, water and water vapour are one stuff, water, and gives each state a job. Grade 3 Topic 21 already taught melting, freezing and evaporating, so the new teaching here is small. A learner may choose the video or the article.
Built: the video and the article both ship; the video says the sameness over Frankie's half-melted bottle in 148 words.
Recommendation: keep the video.
Keep / article only
2. Is "it will not change back" the clue you want, with the property named first?
L03's clue is a changed property that will not change back: a new colour, a new smell, bubbles, or a new kind of solid. The property is always named first, and the frozen puddle that melts back by noon is the one changed-back case. Grade 5 sharpens the signs later.
Built: as above, with two boundary lines now in the article (bubbles in a boiling pot are water vapour, not this clue; a new shape is not a clue).
Recommendation: keep.
Keep / reword
3. May a wax crayon melt in a hot car as a wrong option?
One bank item asks which change makes a new material. One wrong option is "a wax crayon melts in a hot car". You named the melting crayon as the everyday-uncertainty case for Grade 3; here it is never a key, and a hot car does melt crayons.
Built: kept as a wrong option.
Recommendation: keep.
Keep / strike
The lessons
4. L01 The same water, as a solid, a liquid or a gas — Frankie's frozen bottle is half ice and half water by lunch, and Gavin says half her ice is gone. The ice melted into water, and the water is still in the bottle. Solid water keeps food cold, liquid water is for drinking and washing, water vapour cooks food in a steamer. page
5. L02 New material or the same material? — Miss Mendez's match burns to a black, crumbly stick and smoke, and Frankie says the wood disappeared. Six changes are sorted: the match, the nail and the batter make a new material; melting ice, cut paper and dissolved sugar keep the same one. page
6. L03 The clue that a new material formed — an old nail on the picnic table is red-brown and flaky, and Gabriel says it is just dirty. Frankie rubs it, and the red-brown stays. The clue is a changed property that will not change back; the frozen puddle that melts back by noon has no clue. page
Applied without asking
The three reviews changed the edges of the capstone rule and the bank's claim items, not what the topic teaches. The lesson had taught bubbles as a clue that a new material formed without ruling out a pot of boiling water, so L03 now says those bubbles are water vapour, the same stuff, and a quiz item on a boiling pot is keyed no. Torn paper is now the "a new shape is not a clue" case, placed just above the rule, and Grade 3's property sentence is recapped word for word. Five "shows she is wrong" bank items were rebuilt as positive what-is-it items with four accounts a child gives, the key never the longest; two stems that printed their own answer ("water vapor") were re-scened; a typed item that duplicated another now asks for the fourth clue; Topic 14's dissolving sentence is recalled once at the sugar case. In the pictures, the ice in the bottle now reads as ice, the burnt match is short with an ash heap beside it, the steamer is redrawn, every card sits on a ground band, and the wheelbarrow drawing is deleted. The third reader's polish landed tonight: the bank item that re-ran the lesson's rusty nail on a bicycle is now an iron bench under a week of rain, one bank item gained a wrong option a child would pick, and the typed items accept "rust flakes", "gas" and "colour". 53 bank items, 16 to 19 per atom; summary before practice; eight picture placeholders with briefs.
Also on the site
Topic intro and poll · summary and three questions · mixed practice · the PP100 bank · the type sheet
After you answer
Nothing on the page changes if you keep all three. "Article only" drops one video from the batch; "reword" is a text pass on L03 and its items; "strike" swaps one wrong option. Either way the picture pass starts, and the five-video batch goes on your word.
The records, whole
The build record (v1, v2 and the v3 polish)
Skill: course-build → write-lesson (L01 a fact true of every case at recognition level; L02 a two-class sort by an example sequence NE → E → E → E → NE → NE, no term coined; L03 the capstone, the clue that a new material formed, by clue cards with one changed-back non-example) → write-example-sequence, design-check-sequence, sentence-atomise, write-explanation, write-mcqs (quizzes, practice, the 53-item PP100 bank and its type sheet); write-video-script (intro, three lesson scripts, summary; the elementary micro-lesson anatomy); review-figures (author self-check on eight renders) @ b0fa825
Grade 4 Topic 16 — When a change makes a new material — build record (v1, 2 October 2026)
What this is, in plain words
Three short lessons, one per atom, for the Grade 4 Matter sequence. A child meets one running scene: Miss Mendez's class is camping at a state park. First the child sees Frankie's frozen water bottle half melted at lunch and hears the sameness said out loud: ice, water and water vapor are the same stuff, water, in three states, and each state does its own jobs (solid water keeps food cold, liquid water is for drinking and washing, water vapor cooks food in a steamer) — L01, MAT4-024, recognition level. Next the child watches Miss Mendez's match burn to ash and smoke and hears Frankie say "the wood just disappeared"; the lesson sorts six changes into a new material (the match burns, the nail rusts, the batter bakes) and the same material (ice melts, paper is cut, sugar dissolves) — L02, MAT4-060. Last the child finds the red-brown nail Gabriel calls "just dirty" and learns the clue that a new material formed: a changed property that will not change back — a new color, a new smell, bubbles, or a new kind of solid — against the frozen puddle that melts back by noon — L03, MAT4-061, the capstone.
No term is coined. "A new material" and "the same material" are the plain phrases; "physical" and "chemical" are never said (grades 6-8's words, MAT-062/063); "property" is Grade 3 Topic 16's word, recapped once in L03.
Counts. 3 lessons · 3 scripts (149, 149, 150 spoken words, the close counted; 145 / 145 / 143 without it) + intro (117 words, 2 question marks) + summary (120 words, opener exact) · 3 attached questions + the intro's poll + 3 summary questions · 35 quiz items (11 + 12 + 12; 1 written answer) · 13 practice items (10 MCQ, 1 written answer, 2 typed: rust, ash; three Grade 3 retrievals first) · PP100 bank 53 items (18 easy · 20 medium · 15 hard; per atom MAT4-024 16 · MAT4-060 19 · MAT4-061 18; 6 typed, 1 multi-select; key letters A 14 · B 12 · C 14 · D 6, none above 35 %) · 33 figures (24 SVG by code, 7 photo placeholders, 2 cartoon placeholders) · article words 296 / 362 / 420 · checker 0 FAIL, 62 WARN (every WARN answered below) · check_g4_articles.py 0 FAIL · names register exit 0 · page builds · batch built (5 videos, check_brief clean except the intro's standing R79 hit) — NOT sent · blind bundle cut, drawing-line key-word grep 0.
Structural decisions (in place of a blueprint)
Lesson order and titles. L01 "The same water, as a solid, a liquid or a gas" (MAT4-024) → L02 "New material or the same material?" (MAT4-060) → L03 "The clue that a new material formed" (MAT4-061, capstone). The architecture's order; L01 is the doorway (Grade 3's water, said as sameness), L02 sorts, L03 names the evidence (the register's verdict / reason split, JM-P6).
One running scene, three moments. The class campout: Frankie's frozen bottle at lunch (L01); the match that lights the campfire and the ice in the cooler (L02); the old nail on the picnic table (L03). Each lesson video opens by re-establishing the scene (James, Grade 4 demo, 2 Oct). The intro is the campfire at dusk with the cooler beside it: one scene, one headache (the match and the ice both changed — the same kind of change, or two kinds?), the map line, the ready line and the poll. Every scene could really happen: a teacher lights a fire with a match; a child's frozen bottle melts; a child finds a rusty nail on an old table.
Headache per lesson. L01: "Half of your ice is gone" — is Gavin right? (No: it melted into water that is still in the bottle.) L02: "The wood just disappeared" — is Frankie right? (No: it turned into ash and smoke, new materials; the ice turned into water, the same material.) L03: the red-brown on the nail — is it dirt? (No: dirt wipes off; the red-brown stays and will not change back — the clue; it is rust.) Each headache figure carries its answer layer OFF (the bottle strip without its chip; the photos; no card with a verdict before the rule).
Example sequences, written out.
- L01 (a fact true of every case — no non-example differs from "the same water" by one feature only, so cases only, rule last): the frozen bottle, morning → lunchtime (the same water, two states) → the three-states row (ice · water · water vapor, imported from Grade 3 Topic 21) → Grade 3's ring (the five changes change the state, not the stuff) → three jobs in one frame, "<State> water <does its job>. <Example>.": solid keeps things cold (the bottle) → liquid is for drinking and washing (Frankie drinks it) → water vapor cooks food (the steamer) → the uses table → rule.
- L02 (categorical, one frame "The <before> turns into <after>. <After> is a new material." / "<After> is still the same material.", the rule induced after so the frames carry no because): NE ice melts into water (same) → E the match burns to ash and smoke (new) → E the nail rusts (new) → E the batter bakes (new) → NE paper is cut into strips (same: a new shape — the near miss a child believes) → NE sugar dissolves (same: mixed in — the near miss "it disappeared") → the sort table → rule. Each card asks "Did a new material form?" above its chip, so the mark names its question.
- L03 (the clue, one frame "The <property> changed, and it will not change back. That is the clue."): the rusty nail (a new color) → the burnt match (a new smell; a new kind of solid, crumbly ash) → the week-old banana (a new color and a new smell) → the fizzing tablet (bubbles) → NE the frozen puddle that melts back by noon (no clue: the same material; the frosted window in one line) → the clue table → rule.
Check types. L01 type (a) fluency; L02 type (a) fluency; L03 type (c) what / why / misconception / transfer (records below).
Videos. All three lessons are "video and article". L01 could do without a video: it recalls Grade 3 Topic 21 and adds three everyday uses; the article alone teaches it. Its script is written and batched anyway so James can choose.
Simplifications, named here (vault: Name the simplification you made). (1) Dissolving is treated as "the same material, mixed into something" — Topic 14's lesson, taken on its brief sentence "Dissolved sugar is still there." (2) The baked cake (and the fried egg, the toast) is "a new material" without naming what changed inside it; the lesson says "it is not batter anymore" and stops. (3) "It will not change back" is the child's clue here, as the brief asked, not a rule about every change: a changed-back case (the puddle, the frost, the melted butter that sets again) is sorted as the same material. The MS Chemistry Topic 11 line (evidence names a property, never a reversal) is honoured in the frame — the property is named FIRST in every evidence line, and "will not change back" is its second half — and the Grade 4 brief's wording binds over the middle-school rubric. (4) Rust is said to form "on the iron"; a steel object rusting is called steel in the stem and rust in the key, never "the steel turned into rust" as a mechanism.
Questions for James
- Should L01 be an article only (no video)? Context: the atom is recognition level and Grade 3 Topic 21 taught every change; the lesson's new content is the three jobs. Recommendation: keep the video — the sameness said aloud over the half-melted bottle is the atom's one teaching moment, and 149 words carries it. Built: the video and the article.
- Is "it will not change back" the clue you want said, with the property named first? Context: your brief named the changed characteristic that does not change back against changes that reverse; the vault's MS Chemistry Topic 11 line refuses the undo test as evidence. Recommendation: keep it for Grade 4 — the property is always named first ("a new color … and it will not change back"), the puddle non-example is one case, and MAT5-040 sharpens the signs later. Built: as recommended.
- The one crayon. PP-18's distractor "a wax crayon melts in a hot car" is the everyday-uncertainty case you named for Grade 3. It is a distractor, never a key, and a hot car does melt crayons. Recommendation: keep; strike it if you would rather no crayon melts anywhere in Grades 3-5. Built: kept, flagged.
What each lesson teaches
| Lesson | Atom | Lesson type | Example sequence (one frame) | Check type | Items |
|---|---|---|---|---|---|
| L01 The same water, as a solid, a liquid or a gas | MAT4-024 | A fact true of every case, recognition level | the frozen bottle → three states → three jobs → table → rule | (a) fluency: Grade 3 recall · 7 which-state (solid / liquid / gas) · 1 true claim · 2 claims (dried water gone; melted ice a different stuff) | 11 |
| L02 New material or the same material? | MAT4-060 | Categorical sort, NE E E E NE NE, no coin | ice (same) → match (new) → nail (new) → batter (new) → paper (same) → sugar (same) → sort table → rule | (a) fluency: Grade 3 recall · 8 sorts (new / same) · 1 true claim · 2 claims (charcoal disappeared; dissolved salt is new) | 12 |
| L03 The clue that a new material formed | MAT4-061 | Concept, the verdict / reason split, one changed-back NE | nail (color) → match (smell, new solid) → banana (color, smell) → tablet (bubbles) → puddle (changed back) → clue table → rule | (c): Grade 3 recall · 3 what (which clue) · 3 did-a-new-material-form · why FRQ (pancake) · 2 claims (rust is mud; frost is new) + 1 true claim · transfer (shovel) | 12 |
design-check-sequence records
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Skill: design-check-sequence @ b0fa825
Part: L01 (MAT4-024)
Type: (a) one-step categorisation — for an everyday use of water, name the state it relies on (solid / liquid / gas); recognition level.
Plan: Grade 3 recall (melted frost is water; 2 opt, 0) → skating rink (0) · dog's bowl (1) · dumplings over boiling water (2) · snow cone (0) · wet swimsuit dries (2) · garden hose (1) · humidifier (2) → Gabriel's true claim (ice and water are the same stuff: yes) → Gavin's "dried water is gone for good" (no) → Frankie's "melted ice is a different stuff" (no). Three-option string 0 1 2 0 2 1 2 (no position above 3 of 7); two-option string 0 0 1 1.
Belongs in practice/test instead: four-option state items; the "what is the ice / the water in the air" account form (PP types 1–3).
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Skill: design-check-sequence @ b0fa825
Part: L02 (MAT4-060)
Type: (a) one-step categorisation — for a familiar change, say whether it makes a new material or keeps the same material (two labels).
Plan: Grade 3 recall (melted chocolate is still chocolate: yes) → dry leaves burn (new; the one drawn BEFORE/AFTER item, no chip) · bike chain rusts (new) · snowman melts (same) · carrot chopped (same) · egg fries (new) · toast burns (new) · salt into soup (same) · clay rolled (same) → Gabriel's true claim (rake flakes are a new material: yes) → Gavin's "charcoal disappears into nothing" (no) → Frankie's "dissolved salt is a new material" (no). Sort string (first option = new) n n s s n n s s — no four in a row alternate; two-option items 6 / 6.
Belongs in practice/test instead: the four-way sort (new state / new shape / mixed in), the reason-form claims (PP types 4–6).
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Skill: design-check-sequence @ b0fa825
Part: L03 (MAT4-061)
Type: (c) concept — the clue that a new material formed (a changed property that will not change back) and when there is no clue.
Plan: Grade 3 recall (a property: the lemon's yellow color; 2 opt, 0) → WHAT ×3 (copper roof: a new color, 0; vinegar and baking soda: bubbles, 2; butter melts and sets: no clue, 3) → did a new material form? ×3 (frost on grass melts: no; marshmallow blackens: yes; butter browns in a pan: yes) → WHY as a written answer on a FRESH case (pancake batter; read against the article's nail, match, banana, tablet, puddle, frost — none shared) → Gabriel's "rust is dried mud" (no) → Gavin's true claim (paper's ash is new: yes) → Frankie's "frost is a new material" (no) → TRANSFER: which thing on the shovel shows a new material formed (3 opt, 0). Two-option string 0 1 0 0 1 0 1; four-option 0 2 3.
Belongs in practice/test instead: the four-true-observations form, the multi-select set of clues, typed rust / ash / bubbles / color / smell (PP types 8–10).
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The key strings
- Attached questions in video order (L01, L02, L03, summary 1–3): B B C A B C — B 3 of 6.
- Lesson quizzes, two-option items (first option = yes / new): L01
0 0 1 1· L020 0 0 1 1 0 0 1 1 0 1 1· L030 1 0 0 1 0 1; three-option L010 1 2 0 2 1 2, L030; four-option L030 2 3. No position above 60 % within a lesson (S7 clean). - Practice:
0 0 0 0 2 2 0 3 1 0then the FRQ and two typed items. Bank: A 14 · B 12 · C 14 · D 6 of 46 MCQ keys.
The 2 October rules, applied
| Rule (vault note) | Where it bites here |
|---|---|
| Every lesson video opens by re-establishing its scene (Grade 4 demo) | L01 "Here's Miss Mendez's class at a state park campout. This morning Frankie put a frozen water bottle…"; L02 "Here's Miss Mendez's class at their campout. She strikes a match…"; L03 "At Miss Mendez's class campout, Frankie finds an old nail…" |
| A coined term is used from then on; a scaffold noun is retired | nothing coined here; "property" (Grade 3) recapped in one line in L03 then used; "stuff" sits beside "material" in L01 and the summary |
| Lesson text states the fact, never the topic that taught it | "Ice is water, frozen." / "The water that evaporated is still there, in the air, as water vapor." — Grade 3's sentences, no "in Grade 3 you saw" |
| Connectives carry cause; a turn opens with But; if-then named both halves | "The sun warmed the bottle, so half of the ice melted"; "But ice is water, frozen. So the water is still the same material."; "Dirt sits on top of a thing, so dirt wipes off." |
| The positive word | "will not change back" (never irreversible); "stays"; "formed" |
| A question in an article is answered in the next sentence, verdict first | "Is Gavin right?" / "No, Gavin is not right."; "Is Frankie right?" / "No, Frankie is not right."; "Is the red-brown stuff dirt?" / "No, the red-brown stuff is not dirt." |
| A non-example is a near miss, never an absurd case | paper cut into strips; sugar dissolved; the frozen puddle; butter that melts and sets; frost — every one a case a child calls "a new material" |
| No invented apparatus, agents or notices | a teacher's match, a child's lunch bottle, an old nail on a picnic table; the questions come from Gavin, Frankie and Gabriel |
| Every sentence has a subject and a verb (S38) | 0 fragments; "And now a week-old banana has turned brown…" rewritten from a verbless beat |
| Units as words; numerals on chips; biggest / smallest for size only | no numbers with units in this topic; S29 and S39 0 hits |
| Pronouns point at one named thing | "the bottle", "the nail", "the red-brown" repeated as nouns |
| Summary opens "Here's everything we found out about …", recaps rules not examples | 120 words, the three lexicon sentences with "First / Next / And last" lead-ins |
| Intro ≤ 120 words, ≤ 3 question marks, coins nothing, map line, ready line + poll | 117 words, 2 question marks, "To find out, we will look at ice, water and water vapor, at changes that make a new material or keep the same material, and at the clue that tells them apart." |
| An attached question stands alone (S27) | cooler with a bag of ice; a fireplace log; sour milk; hail; a cut apple; a steel chain in a wet yard |
| No option bundles a verdict with its reason | claim items are bare yes / no with the correction in the why; bank claims are the reason form ("Which sentence shows she is wrong?") with four single statements |
| Options parallel in kind; the key never carries an extra clause | the sort set, the clue set and the state set are fixed strings; PP-42's longer key is flagged on the type sheet |
| A stem never names its key (S13) | "Which kind of change is this?" over new / same; "Which state of water…?" over solid / liquid / gas; 0 S13 warnings |
| Recognition before recall; typed only where closed (S30, S33) | no coined term, so no term recall; typed items produce rust, ash, bubbles, color, smell — each a lexicon word or a material the lessons name (closed notes on rust and ash) |
| A blind figure's text describes the drawing, never the answer (coordinator, 2 Oct) | q_card_leaf_pile blind: "before: a pile of brown leaves; after: a flat gray heap with smoke curls above it"; pr_card_wheelbarrow blind: "before: a gray steel wheelbarrow; after: the same wheelbarrow, red-brown, with flakes beside it"; grep of the bundle's [Drawing: lines for new material / same material / rust / ash / clue / verdict / changed back → 0 |
| A verdict mark names its question | every card prints "Did a new material form?" above its chip; every clue card prints "What is the clue?" |
| One depiction per thing, imported | Grade 3 Topic 21's ice cube, puddle, glass, bottle, strip, three-states row and ring; Topic 19's measured table; Topic 17's chip |
| Code draws what must be exact; David's pack renders what must look real | cards, tables, the steamer diagram, rule cards by code; ice, match, nail, cake, banana, puddle, frost as photo_ph; Frankie at the table and the campfire as cartoon_ph; IMAGE_KINDS and IMAGE_BRIEFS complete |
| Closing bullets a few words each (R79) | L01 Ice, water and water vapor are the same stuff: water / Three states: solid, liquid and gas / Each state does its own jobs; L02 Some changes make a new material / Other changes keep the same material / New state, new shape or mixed in: the same material; L03 The clue is a changed property that will not change back / A new color, a new smell, bubbles / Or a new kind of solid; check_brief clean |
| US spelling (S14) | color, gray; 0 warnings |
| A character's name belongs to one topic | Miss Mendez, Frankie, Gabriel, Gavin — Topic 16's row; build_tools_names.py Mendez Frankie Gabriel Gavin → all free, exit 0; bank claim-makers are "a boy" / "a girl" |
Misconceptions confronted (the catalogue is silent on Matter; sources named)
| Belief | Source | Lesson line | Claim item |
|---|---|---|---|
| Burnt material "just disappears" | Driver, Squires, Rushworth & Wood-Robinson 1994, Making Sense of Secondary Science, "Burning"; Andersson 1990 | L02: "The wood did not disappear. It turned into ash and smoke." | L02-q11 (charcoal, no); PP-30 (reason form) |
| Melting makes a new material / melted ice is a different stuff | Stavy & Stachel 1985; Driver et al. 1994, "Materials" | L01: "Ice is water, frozen. So melted ice is water."; L02's ice card | L01-q11 (no); PR-9 (ice pop, no); PP-21, PP-32, PP-39 (reason form) |
| Evaporated water is gone / ceases to exist | Bar & Travis 1991 (J. Res. Sci. Teaching 28); Osborne & Cosgrove 1983 | L01: "Water vapor is water as a gas. It spreads out through the air, and you cannot see it." | L01-q10 (no); PP-20 (reason form) |
| Dissolved solid has gone or turned into the liquid | Driver et al. 1994, "Dissolving"; Topic 14's "Dissolved sugar is still there." | L02: "But dissolved sugar is still there, mixed into the water." | L02-q12 (no); PP-31, PP-41 (reason form) |
| Rust is dirt / a coating that settled on the metal | Driver et al. 1994, "Rusting" | L03: "Dirt sits on top of a thing, so dirt wipes off. The red-brown stays…" | L03-q9 (no); PP-44 (reason form) |
| A big change in look (clear → white, hard) means a new substance | Stavy & Stachel 1985 | L03: "The change changed back, so nothing new formed." | L03-q10 (frost, no); PP-45 (reason form) |
Checker: 0 FAIL, 62 WARN (python3 build_tools_check_topic.py grade4/topic16_build/content/G4T16.py)
- S8 (7) script beats of three or four sentences — kept; each beat is one screen state (the demo's accepted shape).
- S36 (55 words) readability, each answered: flaky, burnt, runny, firm, crispy, crisp, spongy, smoky, buttery, crumpled, wrinkled, slush, sleet, icicle, frosty, thaws / thawing / thawed — the property words the topic needs (a clue IS a changed property) and everyday Grade 4 weather words: fine; disappear / disappeared / disappears — the misconception's own word (Driver), said by the child and corrected: fine; charcoal, grill, humidifier, vinegar, marshmallow, syrup, rink, igloo, lollipop, tortilla, celery, cucumber, bagel, pizza, pasta, burger, yogurt, avocado, scoop, windshield, blade, statue, bronze, sculpture, stalk(s), crayon — US everyday nouns a nine-year-old knows (the allowlist is Grade 3's): fine; fizzing / fizzes / fizzed — the everyday word for bubbles rushing up, said beside "bubbles": fine; condensing — Grade 3 Topic 21's coined word, in one caption: fine; sprays / spray, rinsing — everyday verbs: fine. Swapped before this record: griddle → pan, relies on → needs, soothes → cools / chills, simmers → cooks slowly, underneath → on its under side, concrete → ground, shatters → breaks, fender → door, pinch → spoon, vanished → disappeared, condensed → turned into drops, thaws (one of two) → melts back.
- Clean: S1–S7, S9–S17, S19–S35, S37–S39.
Bank freshness, re-performed
Scene nouns of every lesson, quiz, attached and summary item: bottle, lunch bag, sandwich, cooler, steamer (vegetables), dumplings, match, campfire, nail, picnic table, cake / batter, paper strips, sugar in water, banana, fizzing tablet, puddle, frost / frosted window, skating rink, dog's bowl, snow cone, swimsuit, hose / tomato, humidifier, bench, chocolate bar, dry leaves, bike chain, snowman, carrot, egg, toaster / toast, salt in soup, clay, charcoal grill, garden rake, lemon, copper roof, vinegar / baking soda, butter, frost on grass, marshmallow, pancake, iron gate, shovel, hail, cut apple, steel chain, fireplace log, sour milk, ice cubes. Grep of the bank and the practice set (stems, options, whys), after the re-scening pass: every hit is incidental — steamer (a clothes steamer smoothing a shirt: the same noun, a different job, flagged on the type sheet), sugar / milk / chocolate / leaves / ice cube (why-line vocabulary or a verb — "leaves a gray heap"), window (a window box), knee (a scraped knee: a nurse's scene, not the ice-bag scene). Re-scened in that pass: steaming rice → a steam room; a campfire's logs → a pizza oven; sugar in lemonade → drink powder in a jug; sugar in tea → bath salts; a melting puddle → slush; tomato → cucumber; a boiled egg → a fried potato slice; a chocolate bar in a pocket and a pancake → a snowball and a tortilla; a steak on a grill → ham in a pan; baking soda and lemon juice → cookie dough; vinegar → baking powder; melted butter → melted ice cream; dew on grass → dew on a spider web; an iron gate → an iron fence; a shovel → a horseshoe; a log in a stove → fence boards; sour milk → fuzzy yogurt; ice on a knee → ice chilling a watermelon; soup → oatmeal; a chocolate bar burnt → a bagel; ice cubes in juice → sleet; a pear (typed) → an avocado; an iron chain → iron railings; the practice's apple core → a pumpkin, fall leaves → corn stalks, fire pit → wood stove. The ⟂ draw constraints are on the type sheet.
Figures (33; author's review-figures self-check on eight renders)
Depiction register in figures.py's docstring. Renders opened at 1000 px (Chrome headless): card_match, clue_nail, card_puddle, sort_table, steamer_diagram, bottle_strip, rule_clue, and steamer_diagram / bottle_strip again after fixes. Two fixes applied: the steamer's BOILING WATER chip sat on the frame's bottom edge and the BUBBLES chip hung outside the pot (both moved inside; the frame grown to 320; a chip THE STOVE added under the ring); the half-melted bottle drew its ice at the bottom under the water — ice floats, so the ice is now the top half of the fill and the water the bottom half (the strip, the headache card, the cartoon brief and the alt texts all follow). Every label is drawn by code; every card prints its question above its chip; headache and item cards carry no chip; no person or hand is a glyph.
Sentence-atomise self-check (summary per lesson; every idea line one or two sentences, ≤ 22 words, S1 / S38 clean)
| Lesson | Ideas | One idea per sentence | Cause → effect | Named actor | Verb carries | Plain word before term | ≤ 8 lines per run | Fixes applied |
|---|---|---|---|---|---|---|---|---|
| L01 | 19 | yes | yes (the sun warmed it, so it melted; still in the bottle) | Frankie, Gavin, the bottle, the ice, the water | warmed, melted, keeps, drinks, cooks | "stuff" before "matter" | yes (4 subtitles, 9 figures) | three lines shortened to bring the article under 300 words |
| L02 | 27 | yes | yes (burns → ash and smoke → not wood → new) | Miss Mendez, Frankie, the match, the ice, the nail, the batter | strikes, burns, turned into, rusts, bakes, dissolves | "a new material" — no term | yes (6 subtitles, 11 figures) | one 25-word line split in two; "Here are the six changes in one table" cut |
| L03 | 28 | yes | yes (dirt wipes off; the red-brown stays; will not change back; so a new material) | Frankie, Gabriel, the nail, the banana, the tablet, the puddle | rubs, stays, changed, melts back | "property" recapped before use | yes (5 subtitles, 11 figures) | the bubbles pair and the closing return tightened; "And now a banana, a week old" given a verb |
Judgement calls, recorded
- L03's article is 420 words (L02 362): both above the 300-word WARN line, both under Grade 3's approved ceiling (505). Each has a subtitle or figure every ≤ 8 idea lines and six / five subtitles; L03 carries five clue cases plus the changed-back pair because the atom's payoff is the set of clues. Not split: a check between would cut the example run. Flagged for the reviewer.
- The puddle non-example sits in L03 as "no clue: it changed back" — the brief's wording — with the property named in every evidence line first (see Simplifications 3).
- PP-42's key is the longest option; the distractors share its shape ("They are …") and the length is the clue's two halves. Flagged on the type sheet.
- Rust "forms on the iron": the lessons say rust is a new material that formed on the iron and never say what iron turned into (no oxygen, no mechanism). Steel objects (chain, wheelbarrow, door) rust in items; the key names rust, not "the steel turned into".
- "Smoke" as a new material is said in L02 and L03 without saying what smoke is; the match card's AFTER label is "ASH AND SMOKE" as the brief asked.
- The one crayon (PP-18 distractor) is flagged for James above.
Owed
- Blind review of the bundle
grade4/topic16_build/blind/2026-10-02/(keys sequestered); review-questions and review-figures by a non-author agent; review-accuracy on the rust / smoke / water-vapor sentences. - The video batch is built at
handoff/G4T16/videos/batch_G4T16.jsonwith its READY.md and is not sent (James's word is needed for Grade 4's batches). - The picture pass (7 photo and 2 cartoon placeholders) waits on James's answers to the three questions above (a topic with a question for him waits for sign-off before its pictures).
- Nothing is committed and nothing has left this machine.
v2 — reviews applied (2 October 2026)
Skill: course-build → write-lesson (review-driven rewrite: article and script lines) → write-video-script (one L01 beat, one L01 screen note) → write-mcqs (every item change) → write-explanation (every fb / why / model line) → sentence-atomise (every new sentence) @ b0fa825
In plain words. Three reviews were applied in order of authority: the blind read (every key agreed; its flags table), the guidance review (two holes in the capstone rule and a key tell through the bank's claim type), and the figure review (the ice that read as empty, the match that did not read as burnt, the steamer, the floating cards). Nothing changed in what the topic teaches; every rule sentence is as it was. L03 now rules boiling bubbles OUT of the bubbles clue and a new shape OUT of the clue list, and recaps Grade 3's property sentence word for word. The L03 article is 398 words (from 420) after the frost pair was cut and the two boundary cases were added. Nothing under grade3/ was edited.
Finding → change
| # | Source | Finding | Change |
|---|---|---|---|
| 1 | Blind A, B | PP-3 / PP-6 print "water vapor" in the stem | PP-3 re-scened to a sauna (water on hot stones goes into the air; "Which state of water fills the air?"); PP-6 to tamales on a rack above boiling water ("Which state of water cooks the tamales?"). Neither stem prints the key |
| 2 | Blind A, B; review | PP-53 = PP-48 renamed | PP-53 re-typed to the fourth clue: wet clay fired into a hard pot that will never go soft again → type "solid" (accept solid / a solid / new solid / a new kind of solid …). The reviewer's "dry leaves burn" was L02-q2's scene and a ninth ash item, so a non-ash new-solid case was chosen |
| 3 | Blind A, B | PR-10's key "a new kind of solid" offered nowhere else | the CLUE4 set now names the four clues; PP-37 (cement sets into concrete, no colour / smell / bubble change) is keyed to it, and L03 teaches it twice (the match; the new shape line). PR-10 unchanged |
| 4 | Blind A, B; review | PP-24 "drips and hardens" reads as a new shape | "The wax at the top of a warm candle turns to liquid and drips down its side. Which kind of change is the wax turning to liquid?" |
| 5 | Blind A, B; review | PP-10 option D a place, not a job | "warming the air of a steam room" |
| 6 | Blind A | "dissolve" never carried by a lesson line as Topic 14's | Topic 14 recall line (coordinator, from Topic 14's reviewer), L02 at the sugar case, word for word: "A dissolved material is not gone. It is still there, in the liquid: dissolved sugar is still sugar, mixed into the water." The bank's five dissolve items kept |
| 7 | Blind A | ⟂ constraints | on the type sheet: PP-49 ⟂ PP-15 / PP-30; PP-50–53 ⟂ every clue MCQ; PP-20 ⟂ PP-12 / PP-19; PP-21 ⟂ PP-11 / PP-39 / PP-45; PP-44 ⟂ PP-42 withdrawn (PP-42 is a pear now); PP-3 ⟂ PP-9 and PP-37 ⟂ PP-53 added |
| 8 | Blind B | rust ×12, ash ×8; PP-42 ≈ L03-q12; PP-33 ≈ L03-q2 | PP-42 re-scened to a sliced pear (the one observation of four); PP-33 to a silver fork turning dark in a drawer; two rust items gone from the bank (PP-42, PP-53) → rust 10 across the sets, 3 in the bank (PP-17, 44, 48); ash unchanged at 8 (no ash item added) |
| 9 | Blind A, B | accept lists | rust items (PR-12, PP-48) add rusting, rusty, rusted, rusted iron; PP-50 adds foaming, fizzes, gas bubbles; PP-52 adds odour, stink; PP-51 already took colour; PR-13 / PP-49 already took ashes |
| 10 | Review E1 | boiling bubbles never ruled out | L03 under the fizz card: "Bubbles in boiling water are not this clue. They are water vapor, the same stuff, and they stop when the pot cools." / "The tablet's bubbles need no heating, and their gas is a new material." L03-q5 (frost on grass) replaced by the boiling pot, keyed no; the two-option string is unchanged 0 1 0 0 1 0 1 |
| 11 | Review E2 | property recap drops shape and size; no shape non-example | Grade 3's sentence word for word ("A property is something you can say about an object: its color, its shape, its size, or how it feels."); new subtitle "A new shape": "Paper torn into pieces will not go back to one sheet." / "But the pieces are still paper. A new shape is not a clue." — placed after the changed-back case, directly above the rule, so the rule line itself carries "The clue is a new color, a new smell, bubbles, or a new kind of solid" once |
| 12 | Review E3 | type 6 (PP-21, 32, 39, 44, 45): agreeing or absurd distractors, key longest by 13–45 characters, negative stem | all five rebuilt as positive what-is-it stems with four accounts a child gives; key lengths: PP-21 24 vs 28–32; PP-32 22 vs 27–41; PP-39 26 vs 26–38; PP-44 4 vs 9–13; PP-45 29 vs 30–41. Now type 3. PP-31 and PP-41 (type 6, kept) had the same length tell and their keys were trimmed to the distractors' length (PP-31 39 vs 40; PP-41 42 vs 54) |
| 13 | Review E4 | PP-52 typed stem prints "smell" | "…now gives off a sour stink it never had before. This clue is a new what?" |
| 14 | Review W | FRQ task hands over the model | "Runny, pale pancake batter is poured into a hot pan and turns into a golden-brown pancake. Explain how you know a new material formed." |
| 15 | Review W | CLUE4 set | CLUE4 = a new color · a new smell · bubbles · a new kind of solid (PP-35, PP-37); CLUE4_NO = … · There is no clue. (PP-33, 34, 36, 38). Deviation, recorded: the review said "There is no clue." only on the no-clue pair; an option that appears only when it is the key is itself a tell, so it is offered four times and keyed twice (the lesson quiz's own ratio). The reviewer's "fence boards burn to ash" was PP-15's scene; the concrete case was built instead |
| 16 | Review W | L03 frost pair | cut (two lines, frost_photo deleted); L03-q11 (Frankie's frosted window) is now fresh against the article |
| 17 | Review W | "No, Gavin is not right" to a true sentence | "Gavin is half right." / "Half of the ice is not ice anymore. But that ice did not go anywhere." in the article; forest line and closing return follow; L01 script beat 3: "He's half right: the sun warmed the bottle, so half the ice melted. But it didn't go anywhere: it's water now, still in the bottle." (beat 1 trimmed to keep the script at 148 words) |
| 18 | Review W | PP-27 why "smoke and light" | "smoke and hot gases" |
| 19 | Review W | PP-23 mould is alive | grapes forgotten in a school desk turn soft, brown and sour (the reviewer's sour milk is L03's attached scene) |
| 20 | Review W | Summary q1 hail | "Snow on a playground slide melts into little pools in the sun." (the reviewer's car roof is PR-1's snow-on-a-roof scene) |
| 21 | Review W | keys D 6 of 46 | D 11 of 46 (PP-21, 32, 37, 44, 45 keyed D by their new option order): A 12 · B 11 · C 12 · D 11 |
| 22 | Figures 1 | ice tint ≈ glass; script note reversed | bottle_ice now imports F21.bottle and lays the ICE fill under a white frost HATCH (frost_hatch, one helper, also on frozen_puddle) with two sparkle lines; the ice stays the TOP half of the fill; L01 script beat 2's screen note now says "the top half of the fill is ice, floating, and the bottom half is water" |
| 23 | Figures 2 | match a smooth black stick, no ash, floating | match_burnt: lies on the ground band, 50 of the new match's 70, pale unburnt base, black charred rest with a ragged head end, grey ash heap beside it, smoke above the heap; card_match and clue_match on ground bands |
| 24 | Figures 4 | steamer does not read | redrawn by code (a mechanism is drawn, not photographed): dome lid behind five round vegetables on the tray, four short equal up-arrows from the water through the holes, small bubbles with no chip, chips BOILING WATER · WATER VAPOR · THE VEGETABLES COOK · THE STOVE; frame 420 × 272, no empty top |
| 25 | Figures 5 | five cards float | ground_on=True on card_ice, card_nail, card_cake, card_paper, q_card_leaf_pile (and card_match, card_sugar, every clue card) |
| 26 | Figures 6 | pr_card_wheelbarrow | deleted; the practice FRQ carries its scene in the task |
| 27 | Figures, unplaced | cake_photo | placed in L02 after "Now consider cake batter in a hot oven." (caption "Runny batter in a bowl, and a baked cake."); its brief names left / right and what the eye must see |
| 28 | Figures, minor | bottle redrawn locally; frozen_puddle not in the docstring; "white ice"; no tablet; grains above the spoon; empty band; briefs | bottle via F21.bottle; register lines added for the frozen puddle, the match and the ground band; card_puddle alt says "pale blue, frosted ice" and the article says "hard ice … its look and its feel have changed" (the photo brief keeps "cloudy ice", which is what the photo will show); a white tablet disc on the glass's bottom; grains sit in the spoon's bowl; bam_card drops the question band when there is no question (q_card_leaf_pile); every placeholder brief carries an eye-must-see line and, where two things sit side by side, LEFT / RIGHT |
| 29 | Figures, inherited | cycle_three chip at the frame edge; three_states_row chips on the panel border | recorded, not fixed — Grade 3 Topic 21's drawers; queued for that topic |
Questions for James — built as recommended
- L01 video: kept (the video and the article both ship; the sameness said aloud over the half-melted bottle is the atom's teaching moment).
- "Will not change back", property first: kept, now with the two boundary lines landed (boiling bubbles are not the bubbles clue; a new shape is not a clue).
- The crayon distractor (PP-18): kept.
Counts and key strings (v2)
3 lessons · scripts 148 / 149 / 150 spoken words (close counted) · intro 117 · summary 120 · 35 quiz items (11 + 12 + 12) · 13 practice items · PP100 53 items (18 easy · 20 medium · 15 hard; per atom MAT4-024 16 · MAT4-060 19 · MAT4-061 18; 6 typed, 1 multi-select, 46 MCQ keys A 12 · B 11 · C 12 · D 11, none above 27 %; tags rise with atom order, monotonic) · 31 figures (24 SVG, 6 photo placeholders, 2 cartoon placeholders) · articles 312 / 370 / 398 words.
- Attached (video order): B B C A B C. Lesson quizzes two-option (first option = yes / new): L01
0 0 1 1· L020 0 0 1 1 0 0 1 1 0 1 1· L030 1 0 0 1 0 1; three-option L010 1 2 0 2 1 2, L030; four-option L030 2 3. Practice0 0 0 0 2 2 0 3 1 0. - Bank:
A B C B A C B B A D A C C B A D A C A B D A A B D C A C D B C D A B C D D D B B C A C D D C.
Checks run
build_tools_check_topic.py→ 0 FAIL, 64 WARN (S8 ×7 beats of three or four sentences, kept as one screen state each; S36 ×57 words). New S36 words, answered: sauna, tamales, concrete, cement — US everyday nouns, the stems say what each is doing: fine; slush, stink, rinsed, scoop — everyday words, fine. The 2 Oct answers for the rest stand; frosty now appears once (L03-q12).grade4/check_g4_articles.py→ 0 FAIL; L03 article 398 words.build_tools_names.py Mendez Frankie Gabriel Gavin→ all free, exit 0.build_tools_build_topic_site.py … /tmp/g4t16_v2.html→ builds (3 lessons, 13 practice, 53 pp100, 31 figures).build_tools_video_batch.py→ 5 videos written tohandoff/G4T16/videos/batch_G4T16.json;check_brief.pyclean except the intro's standing R79 line. Not sent.- Figures re-rendered to
/tmp/g4t16_figs/and opened at 1000 px: bottle_headache, bottle_strip, card_match, clue_match, steamer_diagram (twice: the first render hid the vegetables behind the lid; the lid is now drawn first), card_ice, card_nail, card_cake, card_paper, card_sugar, clue_fizz, card_puddle, q_card_leaf_pile — every label inside its frame, every card on a ground band, the ice reads as ice. - Fresh blind bundle
blind/2026-10-02-v2/(107 items held, keys sequestered); grep of its[Drawing:lines for new material | same material | rust | ash | clue → 0 (one drawing line: the leaf pile).
Items whose stem, options, key, model, figure, blind text or accept list changed
L01-V none · L01 forest / article / script beats 1–3 (text) · L02 article (Topic 14 recall line; cake_photo placed) · L03 article (rewritten as above) · L03-q5 (new item: boiling pot) · L03-q8 (FRQ task) · Summary q1 (snow on a slide) · PR-11 (figure removed) · PR-12 (accept list) · PP-3, PP-6, PP-10, PP-20, PP-21, PP-23, PP-24, PP-27, PP-31, PP-32, PP-33, PP-34, PP-36, PP-37, PP-38, PP-39, PP-41, PP-42, PP-44, PP-45, PP-48, PP-50, PP-52, PP-53. Figures changed: bottle_headache, bottle_strip, steamer_diagram, card_match, clue_match, card_ice, card_nail, card_cake, card_paper, card_sugar, clue_fizz, card_puddle, q_card_leaf_pile; deleted: pr_card_wheelbarrow, frost_photo; placed: cake_photo. Type sheet records/TYPES_G4T16.md updated (header, types 3 / 6 / 7 / 8 / 9 exemplars, the ⟂ list, the inventory rows).
Sentence-atomise self-check on the new paragraphs
| Paragraph | Ideas | One per sentence | Cause → effect | Named actor | Verb carries | Note |
|---|---|---|---|---|---|---|
| L01 "Gavin is half right" (4 lines) | 5 | yes | the sun warmed → melted → still in the bottle | Gavin, the ice, the sun, the water | warmed, melted, is | "But that ice did not go anywhere" opens the turn with But |
| L02 Topic 14 recall (3 lines) | 4 | yes (the colon sentence has its verb before the colon) | dissolved → still there → same material | the sugar, a dissolved material | seems, is, mixed | the sentence is Topic 14's, word for word |
| L03 boiling boundary (2 lines) | 4 | yes | water vapor → stops when the pot cools; no heating → a new gas | the bubbles, the pot, the tablet's bubbles | are, stop, need | "the same stuff" kept beside "water vapor" |
| L03 property + clue (4 lines) | 4 | yes | changed → will not change back → a clue | the nail's color | changed, will not change back | Grade 3's sentence unchanged |
| L03 "A new shape" (2 lines) | 3 | yes | torn → still paper → not a clue | paper, the pieces | will not go back, are | a near miss, not an absurd case |
Owed after v2
A second blind read of the 26 changed items is the standing gate before the topic ships (blind/2026-10-02-v2/); the picture pass (6 photo and 2 cartoon placeholders) waits on James's sign-off of the three questions above; the batch is built and not sent; nothing is committed.
v3 — polish (2 October 2026, night)
Skill: course-build → write-mcqs (every item change) → write-explanation (every why line) → sentence-atomise (every new sentence) @ b0fa825
In plain words. The third blind reader agreed every key and left six soft flags. All six are applied; nothing the topic teaches has changed, and no key letter moved (the bank string is as in v2).
| # | Item | Flag (reader C) | Change |
|---|---|---|---|
| 1 | PP-44 | the lesson's rusty-nail "just dirty" scene on a bicycle (the rub, "the red-brown stays", dust / paint / mud) | re-cased: "An iron bench in a park turns red-brown and flaky over the years. A week of rain pours over the bench, and the red-brown stays. What is the red-brown?" — dust the wind blew onto it · mud that splashed onto it · the iron, in a new state · rust. The rain is the wiper, not a child's sleeve; the third distractor is the new-state belief, so the item chains two ideas (hard because line updated). Key stays D. ⟂ PP-48 / PP-17 kept |
| 2 | PP-30 | only one sensible sentence; a guesser lands on the key | "The wood turned into water." (picked by no one) → "The ash is the wood, with a new color." (the same-material belief a child holds); why gains the line "Ash is not wood with a new color: ash is a new material." Key still not the longest (35 vs 38) |
| 3 | PP-32 | option A "mostly water from the ice in it" is half true of real ice cream | "only water, from the ice in it" |
| 4 | PP-46 | the key was the longest option (54 characters) | key "It turned black in the toaster oven." (36); "It froze solid in the kitchen freezer." (38) is now the longest; why follows the key (the black color) |
| 5 | PP-50, PP-51, PR-12, PP-48 | accept lists | PP-50 adds gas, a gas, a new gas, new gas (the stem says "a gas rushes out"); PP-51 adds a new colour, new colour, the colour, colour., colours ("colour" was already accepted); PR-12 and PP-48 add rust flakes, rusty flakes, flakes of rust |
| 6 | PP-53 | "a new kind of what?" — "material" and "stuff" are fair answers | stem now states the verdict and asks for the kind of thing: "… A new material formed, and the clue is that the hard pot is a new kind of ___. Type the one word that fills the blank."; accept list solid forms only (unchanged); wrong_fb for "material" and "stuff": "The stem already says a new material formed. The clue names the kind of thing the pot is: a hard pot is a new kind of solid." |
Checks run (v3)
build_tools_check_topic.py→ 0 FAIL, 64 WARN (the same S8 and S36 lines as v2; new S36 word bench did not fire).grade4/check_g4_articles.py→ 0 FAIL (articles unchanged; L03 398 words).build_tools_build_topic_site.py … /tmp/g4t16_v3.html→ builds (3 lessons, 13 practice, 53 pp100, 31 figures).- Blind bundle
blind/2026-10-02-v3/cut (107 items held, keys sequestered). Bank key string unchanged from v2. - Type sheet
records/TYPES_G4T16.md: PP-44 and PP-30 exemplars, the ⟂ line and the inventory row updated.
Items changed in v3
PP-30, PP-32, PP-44, PP-46 (stem or options; no key letter moved) · PP-48, PP-50, PP-51, PR-12 (accept lists only) · PP-53 (stem and wrong_fb).
Sentence-atomise self-check on the new lines
| Line | Ideas | One per sentence | Named actor | Verb carries | Note |
|---|---|---|---|---|---|
| PP-44 stem (3 sentences) | 4 | yes | the bench, the rain, the red-brown | turns, pours, stays | the "and" in sentence two joins cause (rain) to the observation (stays) |
| PP-44 why (4 lines) | 5 | yes | rain, the red-brown, a new state, the bench | washes, stays, would be, is | 49 words |
| PP-30 option D and why line | 2 | yes | the ash | is | the belief stated plainly, then corrected |
| PP-53 stem (3 sentences) | 4 | yes | clay, a new material, the pot | is baked, formed, is | the blank is the one word asked |
Owed after v3
The topic waits on James's three answers (records/REVIEW_NEXT_G4T16.md, rendered to course_preview/review/REVIEW_NEXT_G4T16.html); then the picture pass and the five-video batch. Nothing is committed.
The guidance, questions and accuracy review
Skill: course-build → review-lesson (Roles B, B2) → review-questions → review-accuracy (non-author pass; filed by the coordinator from the reviewer's hand-back) @ b0fa825
Topic 16 — guidance, questions and accuracy review, 2 October 2026
The topic teaches well and its record is honest (every count re-performed; the science right at Grade 4 depth: rust "forms on the iron", match → "ash and smoke", vapor invisible, no mechanism). But the capstone rule has two holes a nine-year-old will fall through, and the bank's claim type has a key tell through nine of its 46 MCQs.
Essentials. (1) Boiling bubbles contradict the clue: L01's steamer prints BUBBLES on boiling water (same stuff) and L03 teaches "bubbles that rush up are a clue" with no sentence ruling boiling out — add the boundary line and one no-clue item. (2) The shape hole: torn paper, a broken plate and a crushed can do not change back either, yet are the same material; the article never says so, and L03's recap redefines Grade 3's "property" without shape and size — reuse Grade 3's sentence and add the shape non-example. (3) Bank type 6 (PP-21, 32, 39, 44, 45): distractors agree with the claim or are absurd, the key is longest by 13–45 characters, the stem is the negative "shows she is wrong" form; plus PP-3 / PP-6 print the key, PP-53 is PP-48 renamed, PP-52's typed stem prints "smell".
The author's three questions, the reviewer's view: (1) keep the L01 video; (2) keep "will not change back", property first — only with Essentials 1 and 2 landed; (3) keep the crayon distractor.
| where | finding | rule broken | severity | the rewrite |
|---|---|---|---|---|
| L03 article, after the fizz card | boiling bubbles never ruled out | boundary section | Essential | "Bubbles in a pot of boiling water are not this clue. They are water vapor, the same stuff, and they stop when the pot cools. The tablet's bubbles come with no heating, and they are a new gas." |
| L03 quiz q5 (replaces the second frost case) | no boiling item | every check stands alone | Essential | "Water boils in a pot on the stove, and bubbles rush up through it. Did a new material form?" yes / no; why: "The bubbles are water vapor.<br>Water vapor is water, the same stuff.<br>So no new material formed." |
| L03 article "The clue" | property recap drops shape and size; no shape non-example | prerequisites word for word; non-examples | Essential | "A property is something you can say about an object: its color, its shape, its size, or how it feels." … "A sheet of paper torn into pieces will not go back to one sheet. But the pieces are still paper. A new shape is not a clue. The clue is a new color, a new smell, bubbles, or a new kind of solid." |
| PP-44 | agreeing / absurd distractors; longest key; negative stem | distractors are real errors; positive stem | Essential | "Red-brown flakes cover an old bicycle. A boy rubs them, and the red-brown stays. What are the flakes?" rust, a new material · dust stuck on · peeling red paint · dried mud |
| PP-45 | same | same | Essential | "A frozen pond is white and hard, and in spring it melts back into clear water. What does the melting back show?" The ice was water all along. · The ice turned into a second new material. · Rain brought new water to the pond. · The white was dirt on the ice. |
| PP-39, PP-21, PP-32 | same pattern | same | Essential | positive "What is the slush / the ice / the melted ice cream?" with four accounts a child gives, the key trimmed to the distractors' length |
| PP-3, PP-6 | stem prints the key | stem never names its answer | Essential | PP-3 sauna "Which state of water fills the air?"; PP-6 buns in a basket above a boiling pot "Which state of water cooks the buns?" |
| PP-52 | typed stem prints "smell" | check 41c | Essential | "A carton of cream left out for days now gives off a sour stink it never had before. This clue is a new what? Type the one word." |
| PP-53 | PP-48 renamed | fresh instance | Essential | "Dry leaves burn down to a gray, crumbly powder. This clue is a new kind of what? Type the one word." accept: solid, a solid, new solid, a new kind of solid |
| L03 FRQ task | "will never turn runny again" hands over the model | no give-away | Worth fixing | "Runny, pale pancake batter is poured into a hot pan and turns into a golden-brown pancake. Explain how you know a new material formed." |
| CLUE4 set | fourth clue never offered | check 75 | Worth fixing | a new color · a new smell · bubbles · a new kind of solid; "There is no clue." only on the no-clue pair; add "Fence boards burn to gray, crumbly ash. What is the clue?" |
| L03 article frost pair | 420 words; L03-q10's own case | short article; fresh instance | Worth fixing | cut the frost lines and frost_photo |
| L01 verdict | "No, Gavin is not right" to a true sentence | second everyday reading | Worth fixing | "Gavin is half right. Half of the ice is not ice anymore. But it did not go anywhere: it melted into water, and that water is still in the bottle." |
| PP-27 why | "smoke and light" | light carries energy, it is not stuff | Worth fixing | "The firework's powder turns into smoke and hot gases.<br>Smoke is not the powder in a new shape: it is a new material." |
| PP-24, PP-10 D, PP-23, Summary q1, bank keys D 6 of 46 | lit candle; place not job; mold is alive; hail; keys | bar list; parallel options; specific thing; check 74; spread | Worth fixing | warm-candle wax; "warming the air of a steam room"; sour lumpy milk; snow on a car roof melting into pools; four keys to D |
| bank header 54 / 16; "steam room"; "anymore" ×7; PP-11 / 12 / 19 / 20 tagged MAT4-024 under the wider reading | — | — | Leave | one line in the record |
The figure review
Skill: course-build → review-figures (non-author pass; filed by the coordinator from the reviewer's hand-back) @ b0fa825 — figures at g3-5-science commit 776234e
Topic 16 — figure review, 2 October 2026
The before/after cards are clean and the question-above-chip-below shape works. But the ice is almost invisible (the frozen bottle reads as empty), the burnt match is a smooth black stick as long as the new one with no ash, the steamer does not read, and five cards hang in space. Mechanical pass clean (no text outside a frame, no overlap).
Must fix. (1) bottle_headache, bottle_strip: ice tint ≈ glass — deeper tint or a frost hatch plus sparkle lines; keep the half-melted bottle's ice above the water. (2) card_match, clue_match: shorten the stick to about two thirds, charred ragged head end, pale unburnt base, a small grey ash heap; lay it on a ground band. (3) G4T16_lessons.py line 81 screen note says "the bottom half ice, the top half water" — the figure (rightly) has ice on top; fix the note. (4) steamer_diagram: trim the empty top, dome lid, rounded vegetables, short equal up-arrows from the water through the holes, chips off the bubbles — or use David's photo route for the steamer. (5) ground_on=True on card_ice, card_nail, card_cake, card_paper, q_card_leaf_pile (Grade 3 Topic 21 draws the cube and puddle on a ground band). (6) pr_card_wheelbarrow does not read as a wheelbarrow and the stem carries the data — delete.
Unplaced: cake_photo — place in L02 beside card_cake or delete.
Minor: bottle_ice() redraws Topic 21's bottle locally (import rule); frozen_puddle missing from the depiction docstring; card_puddle alt and puddle_photo caption say "white ice" while the render is pale blue; clue_fizz names a tablet with none drawn; card_sugar grains float above the spoon; q_card_leaf_pile keeps an empty question band; seven placeholder briefs lack "the eye must see", four lack left/right. Inherited from Grade 3 Topic 21 (queue for that topic, not editable here): cycle_three chip at the frame edge; three_states_row chips on the panel border.
| key | kind | used by | verdict | what is wrong | the fix |
|---|---|---|---|---|---|
| bottle_headache, bottle_strip | svg | L01 | FIX | ice tint ≈ glass; script note reversed | tint / hatch; fix note |
| steamer_diagram | svg | L01 | FIX | empty top, lid, veg, chips on bubbles | redraw or photo |
| cycle_three, three_states_row | svg (G3T21) | L01 | OK (inherited) | chip at edge / on border | queue G3T21 |
| uses_table, rule_same_water, sort_table, rule_two_kinds, clue_nail, clue_banana, clue_table, rule_clue | svg | L01–L03 | PASS | — | — |
| card_match, clue_match | svg | L02 / L03 | FIX | match not shortened / crumbly, no ash, floats | redraw glyph; ground |
| card_ice | svg | L02 | FIX | cube and puddle float | ground_on |
| card_nail, card_cake, card_paper, card_sugar | svg | L02 | minor | float; grains above spoon | ground_on; lower grains |
| clue_fizz, card_puddle | svg | L03 | minor | no tablet; "white ice" | disc; wording |
| q_card_leaf_pile | svg item | L02 quiz | minor | floats; empty band | ground_on; trim |
| pr_card_wheelbarrow | svg item | practice FRQ | DELETE | not a wheelbarrow; stem carries it | delete |
| frankie_bottle_cartoon, campfire_cartoon | cartoon | L01 / L02 | OK | eye line missing (campfire) | add |
| ice_photo, match_photo, nail_photo, banana_photo, puddle_photo, frost_photo | photo | L01–L03 | OK | eye line / left-right missing | add |
| cake_photo | photo | none | UNPLACED | — | place in L02 or delete |
Three best: card_nail, card_puddle, sort_table / rule_two_kinds. Three weakest: steamer_diagram, card_match / clue_match, pr_card_wheelbarrow.
The blind read and the v2 re-read
Skill: course-build → review-lesson (Role A blind key read, two readers; Role C adjudication by the coordinator) @ b0fa825
Topic 16 — When a change makes a new material — blind read, 2 October 2026
Every key agreed by two blind readers (107 items each; MCQ disagreements 0 for both; the multi-select PP-47 A, C matched; both FRQ models in the key's words). No item with two defensible options except PP-24 (soft, both readers). The intro poll is not bundled by design (no key).
Flags carried into the fix pass
| Item | Who | Flag | Ruling |
|---|---|---|---|
| PP-3, PP-6 | A, B | the stem prints "water vapor" and the key reads "water vapor" | re-scene / re-stem (the guidance review's rewrites) |
| PP-53 = PP-48 (and PR-12) | A, B | one item drawn twice | re-type PP-53 to the fourth clue (a new kind of solid) |
| PR-10 | A, B | key "a new kind of solid" is a clue phrase no lesson item uses | the fourth clue is offered in the CLUE4 set and taught in L03 (the review's rows) |
| PP-24 | A, B | "drips and hardens" reads as a new shape as naturally as a new state | "Wax from a warm candle drips down its side and hardens on the table." — ask about the wax turning liquid |
| PP-10 option D | A, B | a place, not a job | "warming the air of a steam room" |
| "dissolve" items PP-18, 25, 29, 31, 41; PR-01 "evaporating / freezing" | A | words the quizzes never carry | Topic 14 coins "dissolve" and Grade 3 the state words; keep, and have L02 recall Topic 14's sentence once |
| ⟂ constraints | A | PP-49 ⟂ PP-15 / PP-30; PP-50 / 51 / 52 ⟂ every clue MCQ; PP-20 ⟂ PP-12 / PP-19; PP-21 ⟂ PP-11 / PP-39 / PP-45; PP-44 ⟂ PP-42 | on the type sheet |
| rust ×12, ash ×8 across the sets; PP-42 ≈ L03-12; PP-33 ≈ L03-02 | B | a pattern a child can ride | re-scene PP-42 and PP-33; vary two rust items |
| accept lists | A, B | rusting, rusty, rusted (iron), colour, ashes, fizz / foam | add |
Readers' files: blind/2026-10-02/READER_A.md, READER_B.md.
v2 re-read, 2 October 2026 (Reader C on blind/2026-10-02-v2, the whole bundle)
Every key agreed (107 items; MCQ disagreements 0; PP-47 multi A, C matched; typed answers on the lists; both written items in the key's words). The reader's three term checks are met in the lesson text: "rust" (19 mentions), "dissolve" (13, with Topic 14's sentence recalled) and "a new kind of solid" (9) are each coined in a lesson before any item leans on them. Soft flags to the polish pass: PP-44 is the rusty-nail "just dirty" scene on a bicycle — re-case; PP-30 has only one sensible sentence — one stronger tempting-wrong; PP-32 option A "mostly water from the ice" is half-true — "only water, from the ice in it"; accept "gas" on PP-50 (the stem says "a gas rushes out"), "colour" on PP-51, "rust flakes" on PR-12 / PP-48, and tighten PP-53's stem so "material" is not a fair answer; PP-46's key is the longest option. Reader's file: READER_C.md.