Three centuries ago, Francois-Marie Voltaire published his Dictionnaire philosophique, taking in such idiosyncratic topics as adultery, mountains, nakedness, and others besides. In 1957, another French philosopher of more recent vintage, Roland Barthes, mused in his Mythologies on the masculine pursuits of wrestling, striptease and the Citroen DS. Since the dawn of philosophy, the world's great thinkers have been unable to resist the lure of applying their formidable brains not only to the meaning of life, but also to the meaning of coffee, trapped wind or efficient boiler installation. ...