I recently came across a lengthy post on the Dr Mercola (never-use-3-words-if-333-will-do) site extolling the virtues of bidets. Bidets could, according to Dr M’s calculations, save 47,000 megawatts of electricity, 693 tons of chlorine, 1.3 billion gallons of water and 41 thousand trees each day in the US alone… Because that is, apparently, what is …