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Men still need a prescription for the diamond-shaped blue pills. But instead of going to the pharmacy in person, or taking their chances buying from an online pharmacy of unknown repute, men will be able to buy Viagra from the maker of the drug itself and have it shipped to their homes.

Two mothers whose sons were killed during the first Gulf War talk about how they became friends after their sons died. The past 22 years would have been tough without the friendship, because, as one tells the other, "what's in our hearts we share."

Because of fears that lab-altered bird flu viruses could cause a deadly pandemic if they ever escaped the lab, scientists agreed to a moratorium on mutant H5N1 flu research eight months ago. Now top scientists in the field continue the debate about the work, publishing six commentaries for and against the end of the moratorium.

The crowds that cheered the shuttle on Saturday changed their tune after a night of hassles that left the Endeavour still blocking L.A. traffic and threatening trees early Sunday morning.

Radio 1 had an issue: Should itsOfficial Chart show play the song, or would that be too tasteless since it was pushed to the top of the charts by critics of Margaret Thatcher? Those who didn't admire the Iron Lady have used the song to make their voices heard.

It's official: 2012 was the hottest year on record for the contiguous United States. In fact, it shattered the record set in 1998. The National Climatic Data Center says last year was also extraordinarily dry — and drought conditions are persisting into 2013.

The state straddles Tornado Alley and has had a number of especially strong twisters leave a path of death and destruction in their wake.

How much hospitals around the country bill for 100 top procedures became public this week. Though insurance or Medicare may not actually pay the sticker price, some hospitals in Alaska are considering how they'll respond to more knowledgeable consumers.

We've asked NPR journalists to recommend their favorite political Twitter accounts. Here is the first in our series.

A new documentary follows the Metropolitan Opera's controversial staging of Wagner's Ring cycle.