It’s mid-afternoon on a Friday at SpaceX headquarters in Hawthorne, California, and three of Elon Musk’s children are gathered around him – one of his triplets, both of his twins.

Musk is wearing a gray T-shirt and sitting in a swivel chair at his desk, which is not in a private office behind a closed door, but in an accessible corner cubicle festooned with outer-space novelty items, photos of his rockets, and mementos from Tesla and his other companies.

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