Don’t bet on it. In 2004, three statisticians from Stanford and UC Santa Cruz set out to test the classic coin flip. Using a mechanical flipper to ensure identical tosses, they chucked thousands of coins into the air and landed on a surprising conclusion. For a hand-tossed coin, there’s a slight bias toward the side it started on landing face up. While the bias only means the coin lands same-side-up 51 percent of the time, that’s still a better bet than anything you’ll find in a casino.