In later life, Snow insisted that by vocation he was a writer, though he trained as a chemist and did important research in infra-red spectroscopy the main tool in the 1920s and early 1930s for unravelling the structure of molecules.

ECONOMIST: Science in fiction is not science fiction

But those rules still offer a few important rights to fliers, as outlined in this helpful PDF created by a "white-hat" hacker, graduate student and security researcher who goes by the name "Sai" and has made a serious vocation of digging into TSA minutiae.

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One possibility is that mathematical expertise, a character trait possessed by many investors and typically seen as a desirable feature for that vocation, promotes linear thinking.

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He shows that it is indeed possible to turn an avocation into a vocation but also that romantic visions need to be tempered by a willingness to take on pedestrian tasks such as pouring cement and hauling trash.

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