Supplies:
Pie pan
Water
Dishwashing soap
Magnet
Needle
1/4-inch slice of cork
Fill the pie pan with water. Add a squeeze of dishwashing liquid.
Next, magnetize a needle. To do this, use a bar magnet with the north end marked. Scrape the needle across the north end of the magnet, from the eye of the needle to its point. Do this about 15 times. It's important to scrape the needle in the same direction every time -- don't rub it back and forth on the magnet.
Carefully poke the needle through a small piece of cork. Float the cork in the middle of the pie pan. Like magic, the needle will always point north.
Source: howstuffworks.com
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