The video is being made. Until it arrives, here is what it will say (116 words, about 58 seconds):

Here's Salma in the school yard in San Antonio, Texas, early on a clear morning. The flagpole's shadow reaches right across the yard to the fence.

At lunchtime Salma looks again. The shadow is now a short dark shape beside the pole, pointing a different way.

Nobody touched the flagpole. So what does a shadow do between the morning and the afternoon?

Every tree and post in the yard has a shadow that does the same.

To find out, we will measure the shadow every hour, put the readings on a graph, and ask whether just watching counts as real science.

Okay, so are you ready to find out what a shadow does through the day?

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