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Don't let your favorite student tell you that they'll never use algebra again. Mathematicians have now used drones and mathematics to show that unmanned systems can "see" perfectly well without visual sensors - using sound.  It's similar to how bats use echolocation to get around: in this case, it's a drone equipped with 4 microphones and a loudspeaker.  This is … [Read more...] about This is Cool: Math Experts Use Drones to Show it’s Possible to ‘See’ Perfectly Using Sound