Every few weeks someone contacts me with a proposal for what is, in effect, a perpetual motion machine. He (for it is always a he) can demonstrate to my satisfaction that, unlike all the quacks and cranks and mountebanks I have heard about, he really has solved the problem. He has a special catalyst, or a new equation, or a hotline to God, which demonstrates what all other physicists consider impossible: that energy can be created. … My only defence against these people is to ask them for an article in a peer-reviewed journal, whereupon I never hear from them again.
— from Heat, by George Monbiot.