For decades, parents were told to help children build willpower like a muscle, to resist things like junk food and too much time on their screens. But new research suggests a better strategy.

A psychologist explains the evolutionary and psychological roots of laughter, and what an infant’s giggles teach us about how adults bond.

Mayor Zohran Mamdani will announce that New York City is expanding free preschool for 3-year-olds, adding 1,000 seats to meet demand across the city.