Scientists have pinned down why a sprinkler spins when it sucks in water instead of spraying it out — a problem that stumped Richard Feynman and has divided physicists for nearly a century. Richard Feynman was a serious physicist who loved to answer unserious questions. Can math tell you how to order the optimal lunch? Can a human track scents like a bloodhound can by smelling his own footprints? Now, researchers have picked up one of F... [4197 chars]
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