We may need to rebuild civilization from scratch. But where?Bitcoin offers an answer: everywhere and nowhere. After all, it’s a decentralized currency, knit together by the Internet. Both the mining datacenters and the Bitcoiners themselves are spread out all over the world.We can generalize this concept from currency to *community*. Take all the deindustrialized towns, abandoned villages, and empty culdesacs around the world. Many of these places are newly empty because of falling fertility and deindustria ...