The video is being made. Until it arrives, here is what it will say (118 words, about 59 seconds):

Here's Miss Gallagher's class in the school hallway. A book cart rolls away down the ramp, bangs into the wall, and the books slide off onto the floor.

Hazel wants to build something that stops the cart gently. But what should she make it from, and how will the class know if it works? And if it fails the first time, what should she change?

Every engineer who builds a bridge or a bike helmet asks the same questions.

To find out, we will look at how to build something for a job, test it, tell which design did better, and make it better.

Okay, so are you ready to design something, test it and make it better?

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