Talk of the Nation

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.

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.

A paralyzed man with a spinal cord injury to the C7 vertebrae is able to move his fingers again. Surgeons at Washington University School of Medicine rerouted working nerves in the patient's upper arms to restore some hand function. Dr. Ida Fox discusses the procedure described in the Journal of Neurosurgery.

On May 20th, skywatchers in the western third of the United States will be treated to an annular solar eclipse, a sight not seen here in 18 years. Dean Regas of the Cincinnati Observatory shares tips for viewing the eclipse, and tells how solar observers can safely get a peek at the elusive 'ring of fire.'

SpaceX is set to launch its Dragon spacecraft to rendezvous with the International Space Station this weekend. If successful, it will be the first commercially developed, launched and operated craft to meet the ISS. SpaceX head Elon Musk talks about the launch, and his other project, Tesla Motors.

Reporting in Nature, researchers write that two individuals, both paralyzed by stroke, made reach-and-grasp movements using a thought-controlled robotic arm. One participant was even able to a sip a drink by herself. Neuroengineer Dr. Leigh Hochberg discusses the paper and the ongoing trial.

Facebook hopes to raise more than $100 billion in its initial public stock offering. In a piece at Slate.com, tech columnist Farhad Manjoo warns that Facebook users can expect to see changes, including lots more ads. But he warns the company must balance profit seeking with the desires of users.

Transcript

NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. New elections are now set for June 17 after a failure to form a government in Athens earlier this week, but some worry that Greece might be out of the eurozone before votes can be cast. While the great majority of Greeks say they want to keep the euro, opinions polls also show anti-austerity sentiment rising.

And while German Chancellor Angela Merkel showed some flexibility yesterday on stimulus and said she wants Greece to stay in the euro, she also continues to insist that Greece must abide by its commitments for further austerity.

Donna Summer, who sang some of the most memorable anthems of the disco era from "Love to Love You Baby" to "Bad Girls," has died after a long battle with cancer. She had a top 40 hit every year from 1976 to 1984, including the song she once told NPR she'd perform till the very end, "Last Dance."

Truvada is a pill that's already used to treat people with HIV. A daily dose can also significantly reduce the risk of new infection. And a panel recommended the FDA approve an over-the-counter HIV test, OraQuick. Users could test and interpret their results at home in as little as 20 minutes.