This is a STEM type activity using "Oobleck", based on the Dr. Seuss book and drawing from other ideas as well. You still use the Oobleck made from 1 part cornstarch and 1.5 parts water...add coloring as you wish. It is introduced as a mysterious substance that the FBI has asked you to investigate (I do a secret agent/spy theme). Try it out and see what you think. I am using it with fourth grade to also introduce the habits of science standards.