Talk of the Nation

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NEAL CONAN, HOST:

And now Syria and Iraq on the Opinion Page this week. As we reconsider the 10 years since the invasion of Iraq, Washington Post editor Jackson Diehl says we should learn from that costly experience as we consider the civil war in Syria. About absent U.S. intervention, he argues, Syria could produce a much worse humanitarian disaster than Iraq. The tragedy of the post-Iraq logic embraced by President Obama, writes Diehl, is that it has ruled out not just George W. Bush-style invasions, but also more modest interventions.

In Sunday night's NCAA men's basketball tournament, Louisville guard Kevin Ware suffered a gruesome injury. Coach Rick Pitino rallied the team and led them to a victory over Duke. When accidents like this happen, coaches are tasked with rallying team members and keeping them focused.

With samples from over 1,800 separate meteorite falls around the world, ASU's Center for Meteorite Studies claims the world's largest university-based meteorite collection. Meenakshi Wadhwa explains how meteorites can teach researchers about the history of the solar system.

From the rocky fragments in Saturn's rings to Earth's own moon, our solar system bears signs of an ancient demolition derby. Planetary scientist Erik Asphaug describes the role of impacts in our planetary neighborhood, and looks ahead to a possible comet collision on Mars.

When does a story about science become science fiction? Cosmologist Lawrence Krauss and theoretical physicist Brian Greene discuss how to spin a yarn about string theory or the Big Bang, without hyping the science. And novelist Ian McEwan, whose books touch on neurosurgery and quantum field theory, talks about what science offers to fiction.

The Sonoran Desert, which spans some 100,000 square miles in southwestern North America, is one of the most diverse desert ecosystems in the world. Host Ira Flatow and guests discuss some lesser known desert creatures, and explore the secret life of that American southwest icon, the saguaro cactus.

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CELESTE HEADLEE, HOST:

This is TALK OF THE NATION. I'm Celeste Headlee in Washington. Yesterday the Supreme Court heard the last of two cases involving the issue of same-sex marriage, one case on the constitutionality of California's Proposition 8. That proposition banned same-sex marriage in the state of California. The other case is on the Defense of Marriage Act.

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CELESTE HEADLEE, HOST:

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NEAL CONAN, HOST:

Repeated American attempts to work with Russia on Syria have foundered on a fundamental difference. Vladimir Putin insists on a deal that includes Bashar al-Assad as part of Syria's future. So the civil war grinds on and the situation of civilians there grows ever more dire. So why? Arms exports? Access to the port of Tartus? Standing up for old allies?