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Tesla was a true geek who should have received a lot more credit than he did or does today, or at least more than Thomas Edison does. This guy invented the alternating current (AC) electrical system which can transmit electricity over longer distances as well as the world's first hydroelectric plant at Niagara falls, produced ball lightning (in the form of a sphere) which no scientists today have successfully produced and built a tower that would have provided free wireless energy to the entire world had it been profitable at the time. It's a shame that Thomas Edison gets more credit than he does- all he cared about was making money. More info in the link
Contributed by Sam Feldstone