Ooze!
​AKA:  flubber, oobleck, or slime!
Not for consumption, but lots of fun, laughs, and a big mess.  Take this one outside, folks, and have some science fun! 
When children (and even teens) are helping in the kitchen, always use safety first as your motto!
​Supervise carefully and pay attention to details.   Remember - YOU are the responsible one.
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Ingredients:
measuring cups
1 cup of dry cornstarch
large bowl or pan
food coloring (if you want)
1/2 cup of water​
  1. Go outside for this and put on some old clothes!!  Also, don't eat it - it's harmless, but not tasty!
  2. ​Put the cup of cornstarch into a bowl.  
  3. If you want it to be fun colors,  add a drop or two of food coloring.   It WILL stain your hands a bit, but that's part of the fun!
  4. Add water slowly, stopping every now and then to mix it with your fingers until it's all wet.  
  5. Now keep adding a little water at a time, until the Ooze feels like a liquid when you're mixing it slowly.  
  6. Test to see if it's ready by  tapping on the surface with your finger or a spoon.
  7. If the Ooze is perfect, it won't splash--it will feel solid.  If the Ooze is too dry, add a tiny bit more water.  If it's too wet, add a little more cornstarch.  Easy, huh?