Hank Green started making YouTube videos in 2007 with his brother, John. They thought it was a dumb idea, but it turned out well. He is now the CEO of Complexly, which produces SciShow, Crash Course and nearly a dozen other educational YouTube channels, prompting The Washington Post to name him "one of America's most popular science teachers." Green co-founded a number of other businesses, including DFTBA.com, which helps online creators make money by selling cool stuff to their communities; an…
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