In this lab, students create oobleck, everyone's favorite non-Newtonian fluid. They answer questions regarding solids and liquids as they go, and about the mixture as if forms. In the end, they are asked to write their own definition of the mixture based on their observations. This is fun for any age, but the inquiry is an added bonus for higher levels!
*disclaimer: the measurements will change for cornstarch and water. I always add a little bit of each and add cornstarch as necessary.