If you've always wanted to try the elephant toothpaste experiment but didn't want to use hydrogen peroxide, here's a kid-friendly alternative which uses baking soda, citric acid and milk.
Home Science Experiments: No-peroxide Elephant Toothpaste

If you've always wanted to try the elephant toothpaste experiment but didn't want to use hydrogen peroxide, here's a kid-friendly alternative which uses baking soda, citric acid and milk.