Freakonomics reports on one of those scientific studies that when you hear about it has you shaking your head and saying, "Well, duh. Silly scientists."
In a nutshell the researchers findings show that men donate more money to a cause when they know they're being observed by an attractive female, but women's donations don't vary at all even when they know they're being observed by an attractive male. Are you shocked?
The best part of the Freakonomics post was this sentence spoken by one of the researchers: "The research shows that good deeds among men increase when presented with an opportunity to copulate."