Why is Elon Musk spending his time on Twitter, not on the mission to Mars?

DEC 17: He is one of the world's richest men - sometimes the richest, depending on the price of Tesla shares, his main financial asset. With a string of other high-profile companies under his wing, including Tesla, Space X, Starlink, and Neuralink, he is also a subject of global fascination.

Then, of course, there is his own personal story - the tall, 51-year-old billionaire with 10 children ranging in age from one to 18. His first son died aged just 10 weeks. Musk, who was born in South Africa, has described living with Asperger's syndrome, a type of autism, and stated that his main goal in life is to colonise Mars.