Researchers find a colorfully dotted card puts people in a playful state of mind, which can influence what they buy.
Scientists may have figured out which part of the brain makes us think we can win roulette. It's part of the same knot of neurons linked to love and hunger.
Dining customers tended to leave bigger tips when their bills spell out what 15 or 20 percent of their total amounts to.
Researchers show why it's good that the elderly habitually stick to their favorite brands and how less ambitious shopping can make you a happier senior.