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Studies show that the power of suggestion can induce itchiness — but scientists don't know what this irritation is, what causes it, or why it feels so good to cure. Marc Abrahams, editor of the Annals of Improbable Research, talks about how talking about the science of itches might have you scratching right now.

Campaigns, political parties, interest groups — they're all ramping up to register millions of potential voters. The Pew Center on the States estimates there are 51 million unregistered Americans who are eligible to vote. The belief is that even a small number of them could swing the results.

For decades, the Palestinians have urged foreign Muslims to boycott one of the holiest sites in Islam, the Al-Aqsa mosque in Jerusalem. But now, Palestinian religious figures are encouraging such visits, saying they could highlight Palestinian claims in their feud with Israel.

From rooftop apiaries in Paris to a vegetable-and-chicken farm in Philadelphia, agriculture has come to the city. Urban farmer Mary Seton Corboy and food writer Jennifer Cockrall-King talk about the future of food in the city. Plus, Tama Matsuoka Wong gives tasty tips for eating garden weeds.

The Group of Eight is meeting at Camp David this weekend. The setting is leisurely, but there's nothing relaxing about the timing of the summit. While leaders may agree about the need for growth in the debt-ridden European economy, addressing the crisis is easier said than done.

Patricia McCormick's new young adult novel tells the story of Arn Chorn-Pond, a real-life survivor of the Cambodian genocide whose musical skills kept him alive.

With NASA's help, SpaceX is trying to send the first commercial spaceship to the International Space Station. The launch was aborted Saturday morning, but there will be another opportunity on Tuesday. Host Scott Simon speaks with NPR's Nell Greenfieldboyce.

The "Radio Time Machine" is an online application that has collected the top 20 Billboard hits back to 1940. Some transcend their time period, while the appeal of others may be harder to understand. Host Scott Simon speaks with Brett Westervelt, a grad student at Stanford University and the designer of the app.

Tamae Watanabe, 73, reached the summit of the world's tallest mountain this morning. The last time she was crowned the oldest woman to climb Everest was 10 years ago.

U.S. diplomats can breathe a little easier knowing Chen Guangcheng is in the U.S. and the weeks of difficult negotiations and high drama are behind them. Chen arrived Saturday with his wife and two children in New York, where he has a fellowship to study.