Just mix a little bit of corn starch and water and you have such a great teaching tool! Both a solid and a liquid, depending on how to hold it. It you squeeze it tightly, it’s solid and chalky. If you let it rest in your hand and warm up, it oozes out as a liquid.
These are simple little contraptions that fly really well depending on the way it’s made. If you have very few supplies available, this lesson lends itself to exploring air, gravity, engineering, prediction, modifications, and just plain fun. We went to the top of a hill to see whose would fly the farthest! Just a straw with two loops of paper (we used cut up index cards) on each end.