10.     Poincaré said that the greatest act of chance is the birth of a genius when, by chance, the right ovum and sperm meet (after chance orgasm, of course). Poincaré also said that not all mathematicians are cast in the same mold; some are more intuitive; others more logical - but intuitive mathematicians make more discoveries! (See Poincaré, 1908, chapter on Chance.)