While it won't be until July 31 that SpaceX launches another rocket containing human astronauts, the next uncrewed rocket launch from SpaceX is happening very soon. And this launch is particularly interesting because it features a Falcon 9 first-stage booster, and also is a rare moment in which Elon Musk will be...helping out Jeff Bezos ?

Elon Musk remains the world's richest person, with $411.4 billion followed by Larry Ellison of Oracle with $275.9 billion. Mark Zuckerberg is now at third place with $235.7 billion, followed by Jeff Bezos at fourth place with $227 billion.

The 61-year-old Mr Bezos presumably has an even better idea today of what his octogenarian self might regret than he did at 31, 41 or 51, when his 80th birthday was far off. To get an inkling of his current calculus, look at how he spends, first, his time and, second, his $240bn fortune.