Dr Suess' OOBLECK!!!...This stuff is amazing. Mix 2 cups of cornstarch and 1 cup water in a bowl. To color it, add a few drops of food coloring. This defies Newton’s third law of motion–for every action, there is an equal and opposite reaction. If you quickly smack it with uyour hand it immediately turns into a solid, instead of splashing or moving. If you slowly move it reacts like a liquid.... - This is a really fun activity for little kids!