An anonymous reader writes: Young people, when choosing a profession, are often told to "do what you love." That's why we have experts in such abstruse fields as medieval gymel. If there's a worldwide catastrophe in which civilization is interrupted, how useful would that profession be? In a post-apocalypse world, medical doctors would be useful, as would most scientists and engineers. Bad news for Slashdotters is that decades without computers would render computer science and related professions useless. What do you consider to be the most useful and mostly useless post-apocalypse professions? Should everyone be required to study a few apocalypse-appropriate subjects?