Lotteries

Computer simulations link the evolution of risk-averse behavior to the small living groups of early humans.

• By Nathan Collins

Lotteries (both real and fake) are rife with fraudsters who’ve figured out how to game the system and manipulate the gullible.

• By Lauren Kirchner

On the eve of a monster MegaMillions draw, here's another explanation of why those who can least afford it play the lottery: It helps them blow off steam.

• By Michael Todd