Can You Help Me Tie My Shoe? Researchers found that when study participants were asked an unusual request, they were more likely later on to perform a favor. iStockphoto.com hide caption

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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. Mark Duncan/AP hide caption

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Parents can make a difference in whether their kids become spenders or savers, studies find. iStockphoto.com hide caption

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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. Charlie Reidel/AP hide caption

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Hank Aaron breaks Babe Ruth's record for career home runs as he hits No. 715 at Atlanta-Fulton County Stadium on April 8, 1974, on his way to a career 755 home runs. Research suggests that in a wide variety of professions, including collegiate and professional sports, a small but significant number of individuals perform exceedingly well and the rest of individuals' performance trails off. AP hide caption

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Keith Ballard, right, of the Vancouver Canucks is tripped by Colin Fraser of the Los Angeles Kings for a penalty during game in Los Angeles on April 18. Researchers studying hockey penalties found that teams wearing black jerseys were far more likely to draw penalties than teams wearing other colored or white jerseys. Harry How/Getty Images hide caption

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Many Web users have little idea about how, or when, they're being tracked. In this 2011 photo, Max Schrems of Austria sits with 1,222 pages about his activities on Facebook — the company gave him the file after he requested it under European law. Ronald Zak/AP hide caption

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Each year, millions of Americans don't fill their prescriptions because they can't afford to. Maya Kovacheva Photography/iStockphoto.com hide caption

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On days she comes to school hungry, K. Suchitra (center) knows she can eat at school. Ryan Lobo for NPR hide caption

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Future U.S. senator and presidential candidate John Kerry poses with crewmates during the Vietnam War in this file photo. An attack on his service by a group calling itself the Swift Boat Veterans for Truth is remembered as a turning point in the 2004 election. But political scientists say negative ads might not be that effective. AP hide caption

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President Obama signs the Affordable Care Act in the East Room of the White House on March 23, 2010. Data suggest that racial attitudes of ordinary Americans shape both how they feel about the health care overhaul and how intense those feelings are. Chip Somodevilla/Getty Images hide caption

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