What makes the female so much deadlier than the male? With assists from Fran Lebowitz, Nora Ephron, and a recent Stanford-medical-school study, the author investigates the reasons for the humor gap. by Christopher Hitchens January 2007 B e your gender what it may, you will certainly have heard the following from a female friend who is enumerating the charms of a new (male) squeeze: "He's really quite cute, and he's kind to my friends, and he knows all kinds of stuff, and he's so funny … " (If you yourself are a guy, and you know the man in question, you will often have said to yourself, "Funny? He wouldn't know a joke if it came served on a bed of lettuc...