And you thought a hamburger was just a hamburger. From the NYTimes article"Evolution on the Meat-Sex Exchange": "Leonard Shlain, a surgeon, is the latest to jump in with "Sex, Time and Power," in which he makes a case for concentrating on women and their need for the mineral iron as the key to understanding our past. Women need high stores of iron, Dr. Shlain says, because they menstruate every month, become pregnant and nurse. In our evolutionary past the best way to restore depleted iron was to eat meat. But women were probably not hunters, and so they must have manipulated men with sexual favors to bringing home a blood-soaked dinner. This manipulative move, Dr. Shlain suggests, then set into motion just about every aspect of human behavior."