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He may not be a pop-celebrity, but Elon Musk, the founder of Tesla and SpaceX (now worth $21 billion), used to be a janitor.

Fact Lab

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Interesting fact:

That’s right, Elon Musk had to put on a hazmat suit when he worked as a janitor of a boiler room at a lumber mill. He said that: ‘if you stay in there for more than 30 minutes, you get too hot and die.’

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