GOOP!

Have you heard of GOOP? It acts like a solid when under pressure or moving, but like a liquid when at rest. Super neat, super easy and LOTS of entertainment!
What you need:
1c Cornstarch
1/2c water (I used a splash more)
**Optional: food colouring

Mix the cornstarch and water and PLAY! You can add drops of random food colouring to teach colour mixing or just for fun (it's kind of messy, but nothing some soap and warm water can't fix).