Noticing that the hair on the top of my head was somewhat thin, an acquaintance contributed the dubious bit of wisdom that it is now a proven fact that if you eat six bananas a day, you will have a full head of black hair.  “Ah, come on,” I countered.  “Nobody but a monkey eats six bananas a day.” “Have you ever seen a bald-headed monkey?” the person—now a former friend—chided, adding, “That is proof that it works!”