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What happens when you mix cornstarch and water? 

This is a kind of messy experiment - but it does clean up really easily. Do this somewhere that you can make a bit of a mess, and do this:
  • Take some cornstarch, and put some in the bowl.
  • Slowly add water. As you add the water, stir the water into the cornstarch. Do not use a spoon - use your hands to do this. This is part of the fun, and you will also be able to tell when you have put in enough water!
The key is to add just enough water so that the cornstarch and water mix will flow very, very slowly. Now you have something which is a very strange goo indeed. If you walk fast enough, you can actually walk on it.

This video will explain the unusual properties of these two substances. 

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