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Northwestern University says these are the world's smallest human-made flying structures, and they could be used for monitoring the environment, population surveillance or disease tracking.

He joined an elite group of Major League players — and came very close to becoming the first ever to hit five home runs in a single game.

The morning after a stinging defeat in South Carolina, former Massachusetts Gov. Mitt Romney said he would release his most recent tax returns this week, ahead of the Florida primary. The move was applauded by former House Speaker Newt Gingrich, who won South Carolina.

Two senators who have taken the lead on legislation aimed to help homeowners refinance are blunt about how concerned they are by the news NPR reported about Freddie Mac's "multibillion-dollar bets against American homeowners being able to refinance."

It may not look like a catalog Christmas, but family traditions are what make the holidays special. Commentator Ken Harbaugh explains why he loves decorating with his family — oddball ornaments and all.

An NPR-Thomson Reuters Health Poll finds 21 percent of Americans believe autism is linked to vaccines. Most people believe vaccines work. Among those with concerns about vaccines, uncertainty about long-term health effects is the biggest fear.

Allyson Felix has won the women's 200 meter race in London's Olympic Stadium, running a time of 21.88. Jamaica's Shelly-Ann Fraser-Pryce took the silver medal at 22.09, as she wasn't able to track Felix down in the closing stretch.

Forests on the island of Guam are experiencing a spider epidemic, and invasive brown tree snakes are to blame. The snakes have nearly obliterated the island's native forest birds — which used to keep spider numbers in check.

Lincoln Cemetery in Montgomery, Ala., was established in 1907 for African-Americans. But with no one in charge of the cemetery or keeping burial records, abuse, vandalism and neglect became rampant. And no one is sure where people are actually buried. Recently, volunteers began cleaning up and documenting the graves.

The well-staged London Olympics have drawn to a close and on Monday, thousands of fans made their way to airports for the flight home.