Sometimes it feels like it's Elon Musk's world and we just live in it.
The incessantly inventive, endlessly eccentric billionaire has succeeded in buying Twitter, putting him in charge of the social media platform where the world debates, gathers, and bickers.
It's Musk's latest achievement, after he revolutionised the automobile business, launched his own rocket into space, and even amassed the world's largest wealth becoming the world's richest person last year, dethroning Amazon's Jeff Bezos.
Let's take a look at his companies, what they do and how much they are worth: