The video is being made. Until it arrives, here is what it will say (120 words, about 60 seconds):

Here's Miss Okoro's class on a stormy afternoon. The lights go out. For one minute the room is dark, and then the lights come back on.

Maddox asks where the electricity comes from. Miss Okoro says some of it comes from the wind, some from a river, some from sunlight, and some from plants.

But how can moving air, or a river, or sunlight, or a log, end up as light in a classroom lamp?

To find out, we will look at the tall towers with blades on a hill, a wall across a river, dark panels on a roof, and a log burning in a stove.

Okay, so are you ready to find out where the electricity comes from?

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