An incentive system that gave bonuses to teachers upfront, with the threat of having to give the money back if student performance didn't improve, proved effective in one study.
Megan Lutz, left, and Justin Chun react to amateur comedian Robert Lynch at the Metropolitan Room in Manhattan, N.Y. Lynch is an anthropologist researching what laughing reveals about us.
Melanie Burford for NPR
Who's The Happiest? Researchers studied photos of Olympic medalists to learn who is the happiest. Here, bronze medalist Aliya Mustafina of Russia, gold medalist Gabby Douglas of the U.S., and silver medalist Victoria Komova of Russia pose after the all-around gymnastics final.
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Traffic rolls past a speed limit sign in Ohio. Researchers believe they have found a new way to encourage drivers to stay within a safe driving speed: giving them a financial reward that diminishes as they speed.
President Bush and then-Democratic presidential nominee John Kerry shake hands at the end of a presidential debate in 2004 in St. Louis. Researchers want to better understand why partisans' views of the facts change in light of their political loyalties.