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<p>Muons are very small fundamental particles that are much heavier than they should be. <br /> <br /> they fall apart pretty quickly, but they rain down on us. It's magical.<br /> <br /> Today's physicists are Ryan Martin, the particle physicist; and Diana Cowern, host of the "Physics Girl" youtube channel.</p> <p> </p> <p>Our Guest this time is Sarah Gailey, the author!</p>