Conversation Hearts Oobleck
Oobleck is what is called a non-Newtonian Fluid. When pressure is exerted on it like squishing it or scooping it up, it acts like a solid. When there is no pressure exerted on it, it flows like a liquid. Scoop it up with a spoon like a solid and watch as it slowly melts off the spoon like a liquid. Amazing!
A handful of Conversation Candy Hearts
Mix the water and cornstarch until you have a consistency that isn't pure liquid but also isn't crumbling.
Add in the conversation hearts.
Pour into a shallow dish.
Cookie cutters, spoons, scoops, and bowls make for great toys for this activity!