The Naked Egg Science Project - Stick egg in vinegar (enough to cover egg completely), seal and put in fridge for 3 to 5 days. Stir once every day. It bounces when done! But be careful, it can still pop. Soak it in corn syrup to make it shrivel up, then stick in water with food coloring. Osmosis will fill the egg back up but this time with the coloring on the inside! Fun for kids and grown-ups!