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North Korea's ambassador to China rejects any U.S. preconditions on talks. But he demanded North Korea's own precondition before it would agree to shut down its nuclear program -- a nonaggression treaty with Washington. Anthony Kuhn reports.

The director of the Los Alamos National Laboratory resigns, along with his top deputy, amid Department of Energy accusations that managers ignored fraud and theft by lab employees. The DOE spends $1.5 billion a year to run the lab, birthplace of the atom bomb. NPR's Christopher Joyce reports.

Each year, U.S. tourist attractions recruit thousands of foreign workers. But in some places --such as Lake Placid, N.Y. -- foreign workers aren't so welcome. Critics say the influx from abroad keeps wages low and makes it hard to earn a decent living. Brian Mann of North Country Public Radio reports.

China is setting some lofty goals. For the first time, the nation prepares to send people into space. They'll be called Taikonauts. Robert Siegel and Lynn Neary explain.

Commentator Aaron Freeman hopes he caused his sister's brain tumor. When they were children, he kicked her in the head. As an adult, she developed the tumor. The exact cause isn't certain, but the other probable cause is genetic - and the gene is linked to breast cancer - so he hopes that it is the kick, and not the gene, that is the culprit.

Pianist and singer Vienna Teng recorded most of her debut full-length CD, Waking Hour, while studying computer science at Stanford University. After graduating in 2000, Teng took a job as a computer engineer, but quit this past spring to perform her music around the country. NPR's Liane Hansen talks with Teng about her music.

The bacterium D. radiodurans can survive thousands of times more radiation than any other living creature -- because it has a unique ability to repair genetic damage extremely efficiently. Scientists have been trying to discover how the bug pulls of this nifty trick for 40 years. NPR's Jon Hamilton reports.

The escalator arrives in Cambodia, and it's catching on -- though some shoppers need a little help figuring out how to use it.

The seven men arrested in Britain over the weekend were allegedly manufacturing Ricin, a poison made from the berries of a common ornamental plant. NPR's Ketzel Levine looks at the plant itself.

A group describing itself as "anonymous animalists" seems to have entered a dangerous area and rescued the dogs, leaving a banner signed by the fictional commando group.