Oobleck

How to make it

1. 

   1

   Pour the cornstarch

   Dump the cornstarch into a big bowl.

2. 

   2

   Add water slowly

   Pour in water a little at a time and mix with your hands. Add color now if you want.

3. 

   3

   Find the sweet spot

   Stop when it drips like syrup but feels hard when you tap it. Add cornstarch if it's too runny.

4. 

   4

   Test it

   Punch it fast. Then rest your hand on top. Roll a ball and open your palm.

5. 

   5

   Talk about why

   Cornstarch bits float in the water. Push slowly and they slide past each other. Push fast and they jam together like a crowd at a door, so it feels solid.