Neil Armstrong, the first man to walk on the moon, died over the weekend at the age of 82. Steve Inskeep talks to Neil Degrasse Tyson, director of the Hayden Planetarium in New York, about Armstrong's impact on space exploration.

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DAVID GREENE, HOST:

In Russia, three members of a feminist punk band are preparing to appeal their two-year prison sentences. The young women were convicted 10 days ago of hooliganism after staging a protest in Moscow's main Orthodox cathedral. The group, Pussy Riot, also announced on Twitter yesterday that two other members who took part in that protest have fled the country to avoid being arrested. The tweet came after police said they were still searching for the activists, who are part of a broader opposition to Russia's President Vladimir Putin.

Tropical Storm Isaac is expected to strengthen into a hurricane as it churns through the warm waters of the Gulf of Mexico. While its exact track is still uncertain, parts of Florida are being hit by the storms outer bands. Mississippi, Alabama and Louisiana are preparing as well.

John Walker Lindh was a middle-class kid in Northern California who converted to Islam and went to travel the world. U.S. authorities eventually captured him in Afghanistan after Sept. 11, when he was allegedly fighting alongside the Taliban.

His story was the focus of a Law and Order episode, and a song called "John Walker's Blues" by Steve Earle.

For the past five years, Lindh has been living in a secret prison facility in Indiana with convicted terrorists, neo-Nazis and other inmates who get special monitoring.

After a month-long offensive in Aleppo, Syria's largest city, rebels are struggling under a fierce counter offensive by the Syrian military and the outcome is far from clear. But the future of Aleppo, the country's financial hub, is already under discussion in secret meetings on the Turkish border.

Over cups of sweat tea in a Turkish border hotel, Moeihmen Abdul Rahman, a lawyer from Aleppo, sits down for his first meeting with Abu Riad, a commander from the Al Tawheed brigade, a coalition of rebel militias leading the assault on Aleppo.

The American Academy of Pediatrics on Monday announced its first major shift on circumcision in more than a decade, concluding that the health benefits of the procedure clearly outweigh any risks.

"There is clear evidence that supports the health benefits of circumcision," said Susan Blank, who led the 14-member task force that formulated the new policy being published in the journal Pediatrics.

Republican presidential candidate Mitt Romney says he favors keeping all of the Bush-era tax cuts and then adding some more. To pay for these cuts, he would reduce or eliminate some of the tax deductions that many Americans have come to rely on. But his proposals are already facing a lot of resistance.

As we age, our sleep patterns change. We've all heard the complaints: "I wake up in the middle of the night and can't get back to sleep!"

Some sleep experts estimate that as many as 40 percent of older adults suffer sleeping problems such as sleep apnea and insomnia. Now, researchers have found a link between disrupted sleep and cognitive decline.