As part of our cub scouts we were looking at navigation. So we rubbed some strong neodynium magnets across a sewing needle about 100 times. Aligns the electrons in the atoms of the needle to point the same direction like in magnet. Then you place that in a bottle top or cork, sit on the top of some water and it the north pole of the magnet will turn to line up with the South pole of the earth magnetic field.
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