The New Yorker has a fascinating deep dive on tech and finance billionaires stocking up for the end of the world, something the cofounder of LinkedIn believes that "fifty-plus per cent" of his peers have opted into.

The trendy destination? New Zealand — friendly, isolated and stable. Buying a house there is a "Masonic handshake" amongst ultra-wealthy survivalists.

Well, when you put it that way... From the unnamed CEO of a large tech company: "Go risk factor by risk factor by risk factor, acknowledging that there are many you don't even know about, and you ask, 'What's the chance of this breaking in the next decade?' Or invert it: 'What's the chance that nothing breaks in fifty years?'"