The video is being made. Until it arrives, here is what it will say (109 words, about 54 seconds):

Here's a small stone and a big sponge. Which one has more stuff in it?

Amira says the sponge, because it's bigger. Is she right?

Now let's drop a marble and a bolt into two glasses of water. The water moves up in both. Which one takes up more space?

And now let's go to two bowls of water. Perla's left hand says warm. Her right hand says cool. About the same bowl!

That's what this topic is about: deciding which of two things has more, more stuff, more space, or which is warmer, by measuring, not guessing.

Okay, so are you ready to find out which has more?

It ends with a ready line. Then pick a reply below — any reply counts.