Bubble, Bubble, Toil and Trouble. Witches Brew- Preschool Goo- it's all the same thing. 4 c Corn Starch + 2 c water = sensory fun for the 5 and under crowd. Lincoln kept trying to taste this tasteless concoction but other than that we had a fun time mixing and mashing. If you can imagine a substance that is simultaneously liquid and solid you will begin to understand this goop. Fluid as it touches water and hard as it touches air. Chalky and slimy all at the same time. I love home preschool.