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Ashley Dias needs lungs. So do lots of other patients. Scarcity is a problem with organ transplants, and, unlike other scarce resources, organs can't be bought or sold. Here's how doctors decide who gets to be at the top of the waiting list.

Former Mass. Gov. Mitt Romney has long held a commanding lead in the polls ahead of Tuesday's primary in New Hampshire. Taking nothing for granted, Romney campaigned in the state on Sunday with two of his top surrogates: former Minnesota Gov. Tim Pawlenty and New Jersey Gov. Chris Christie.

Astronomers want increasingly large telescopes to peer into the depths of space. To build a solid telescope mirror nearly 30 feet across, you need an oven that heats to 2,100 degrees Fahrenheit and spins around like a top.

In Egypt's first presidential debate, only the top two candidates participated. Voters go to the polls later this month to choose among a field of 13 candidates. The winner is expected to be decided in a runoff next month.

As the debate over the political calculations behind President Obama's endorsement of gay marriage continue, Host Scott Simon checks in with acclaimed novelist and screenwriter Armistead Maupin to talk about this as a cultural moment.

Zimbabwe suffered out-of-control inflation four years ago, and it ravaged an economy already in decline. Today, the economy has stabilized and the shops are full, though many Zimbabweans are still struggling.

It's known as the quiet period — the SEC-mandated time before an initial public offering when a company's top officials have to avoid anything close to hype. And with Facebook's IPO expected next week, CEO Mark Zuckerberg and his colleagues are pretty much staying mum.

Singer-songwriter Carole King started young: She was just 15 when she founded a doo-wop group with her classmates. The act never took off, but King eventually became one of the biggest-selling artists of all time. She tells the story of her career so far in a new memoir, A Natural Woman.

After competing in five Olympic Games, 56-year-old Butch Johnson's peers hail him as a superman in the world of archery. But Johnson says he's more of a Clark Kent. His two Olympic medals are stored under a sink, and he spends his days managing an archery range in Connecticut.

Now he's trending on Twitter after leading a woman to safety from her burning home. He's even said to be tougher than Chuck Norris.