Check out this instructional science video to learn how to make a compass floating in glass of water. You will need a sewing needle, a standard refrigerator magnet, and a piece of toilet paper. Nestle the needle into the toilet paper and place it into a glass of water. The toilet paper will absorb the water and inevitably sink, but the needle will become an instant compass pointing north and south without fail. Have fun with this science experiment with the kids by playing with the magnet.