Interesting stories often lie encoded in names that seem either capricious or misconstrued. Why, for example, are political radicals called “left” and their conservative counterparts “right”? In most European legislatures, maximally distinguished members sat at the chairman’s right, following a custom of courtesy as old as all our prejudices for favoring the dominant hand of most people. (These biases run deep, extending well beyond can openers and writing desks to language itself, where “dextrous” [sic] comes from the Latin for “right” and “sinister” for “left.”) Since these distinguished nobles and moguls tended to espouse conservative views, the right and left wings of the legislature came to define a geometry of political views.
–Stephen Jay Gould, The Mismeasure of Man [1996, p. 401]