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The so-called hygiene hypothesis is right. Scientists say they've figured out how exposure to germs in infancy reduces the risk of allergies and other immune system problems.

President Obama made his first public comments Friday about the Trayvon Martin shooting, which opened him up to approval and suspicion in this racially and politically polarized nation.

In congressional testimony, the former New Jersey governor said he did not know where missing customer funds had gone.

President Obama's pick to lead the World Bank is an unconventional choice with a background in global health and development. The current monetary group head has a trade and economic background. Jim Yong Kim currently serves as president of Dartmouth College.

The singer-songwriter started performing ukulele covers on YouTube as a way to keep up with friends and family while away at college. Thanks to a discovery by Ben Folds and a successful Kickstarter campaign, Nunes is gaining recognition for her original music.

The Supreme Court on Monday begins the first of three days of historic oral arguments on President Obama's health care law. The court has boiled the arguments down to four key constitutional questions. First up: Does the court even have the jurisdiction to hear this case right now?

The U.S. Supreme Court hears challenges to the new health care law, with arguments touching on states' rights, mandatory insurance, and Medicaid. To introduce those concepts — and to give the rest of us something to do while the court hears six hours of arguments — we offer a word search game.

Royal Dutch Shell can't pay the $1 billion it owes Iran because of sanctions imposed on the Middle East country by the United States and European Union. The sanctions have made it nearly impossible to transfer the money. Reuters reports that Shell is trying to wrap up its business dealings with Iran.

Her husband "loves children, he's like a big kid himself," Karilyn Bales tells NBC News of Staff Sgt. Robert Bales. He faces 17 counts of murder for attacks carried out on March 11 in Southern Afghanistan. One victim was an unborn child, officials say.

For the first time since February, there's no Republican nomination contest this week. Over the weekend, in the Louisiana primary, Rick Santorum won big. But overall, Mitt Romney continues to hold a decisive lead in delegates.