Light Optics

They're on your refrigerator, they're inside your computer, and you're even standing on one right   now. They're magnets, and forget about being repulsed. Bill Nye the Science Guy's ""Magnetism"" episode   is totally attractive.   All magnets have certain things in common. All magnets have two poles - north and south. You could   take a magnet and break it into pieces and all of the pieces would have north and south poles. Ever play   with two magnets? If you hold them with one magnet's north pole facing the other's south pole, they will   stick together. If you put two of the same poles together, the magnets will push apart. With magnets,   opposite poles attract, and ""like"" poles repel.   Ever wonder why the Earth has a North and South Pole? The Earth's hot, churning, iron core is like a giant   magnet. The magnetic force of the Earth stops a lot of harmful radiation from reaching us. Charged   particles streaming from the Sun get pulled down by the Earth's magnetic field, creating the