Really good for a PEOP lesson or a Science connection :) Alka Seltzer Blob Bottles! - Such a great craft to do with kids! Need: 1 Liter (or any size) bottle, regular water, cooking oil, food coloring, and Alka Seltzer.
Place milk in shallow dish- add drops of food coloring. Now grab a *magic* toothpick. Just dip the end in dish soap & touch the milk with it. Colors instantly shoot out at lightning speed creating a wake of rainbows.