Mark Rober spent years trying to land a rover on Mars. Now, the former NASA engineer turned science YouTuber with millions of subscribers is launching a new mission: to teach the next generation of big problem solvers. That's why he's spending 60 million dollars to build a STEM curriculum kids actually want. With squirrel obstacle courses, giant lasers and elephant toothpaste explosions, who wouldn't want to learn from YouTube's top engineer?

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