Silly guy just finished up his unit in Science "Changes in Water and Matter." We just had to do this tasty experiment: making ice cream in a bag. Here is the recipe if you want to give it a try. As you can see this experiment got three thumbs up.
What you'll need:
1 tablespoon sugar
1/2 cup milk or half & half
1/4 teaspoon vanilla
6 tablespoons rock salt
1 pint-size plastic food storage bag (e.g., Ziploc)
1 gallon-size plastic food storage bag
How to make it:
1. Fill the large bag half full of ice, and add the rock salt.
Seal the bag.