Elephant Toothpaste - cup hydrogen peroxide liquid is a solution, which can be found at a beauty supply store or hair salon), 1 Tbs (one packet) of dry yeast, 3 Tbs of warm water, liquid dish washing soap and food coloring
Weather experiment - take a clear plastic cup and add plain water. Put a small amount of shaving creme on top. Then a few drops of red and yellow food coloring. The food coloring slowly finds it's way down into the water to make ORANGE rain! What fun!