Hands-on science with squishy circuits

This looks like very interesting game for children.
Do things easy so that your children can understand them.
http://courseweb.stthomas.edu/apthomas/SquishyCircuits/index.htm
What we need?

1 1/2 cup Flour
1/2 cup Sugar
3 Tbsp. Vegetable Oil
1 tsp. Granulated Alum (optional)

(The alum helps preserve the dough.)
1/2 cup Deionized (or Distilled) Water

(Regular tap water can be used, but the resistance of the dough will be lower.)