This stuff is amazing. My boys (okay and me too) were totally taken with this goo. Oobleck defies Newton's third law of motion--for every action, there is an equal and opposite reaction. If you quickly smack oobleck with your hand it immediately turns into a solid, instead of splashing or moving. If you slowly move oobleck it reacts like a liquid. Needless to say our oobleck took a lot of fist smacking! Our kitchen was filled with lots of "Wow," "Cool," wide eyes of amazement and much laughter!"
Making Moon Sand:
You can experiment with the ingredients until you get it exactly how you like it. Be careful though, it is very easy to get sandy oobleck! When finished playing, cover and store. Next time you play add a few tablespoons of water if it needs to be moistened.
Making GAK Slime: