First, why would you want to survive an apocalypse? There’s a T-shirt that says, Knitting is not only an art; it’s a post apocalyptic survival skill. Well, yes, assuming you can find wool, and knitting needles, and that you still have some of your fingers and at least one eye. Post-apocalyptic life will be, in the words of Thomas Hobbes, “solitary, poor, nasty, brutish, and short.” Why bother? The only thing you’ll need a knife for is to open a vein, and you can do that with a piece of broken glass, of which there will be lots lying around.