OOBLECK

Definition: a substance that acts like a liquid, and can be poured, but that acts like a solid when you apply force to it by pushing it or squeezing it. It's made by mixing cornstarch with water.

Oobleck is a non-newtonian fluid.

They had so much fun with this!

Cassidy did not like the idea of touching it, so she 

spent the time trying to clean up after Mason and Ellie. 

She did an awesome job!