If the apocalypse comes, then you should know how to use bitcoin, so that you stay in the world, when everything else collapses and you have no one to turn to. Any reason can cause an apocalypse, it can be a natural and economic disaster, as well as a social one. When the world changes beyond recognition, your friends may cease to be your friends and the cryptography will be where it was. #bitcoin #cryptocurrency #HowToUseBitcoin #income #SpendBitcoin