Talk of the Nation

The documentary Bully caught national attention when it received an R rating for harsh language from the Motion Picture Association of America. Harvey Weinstein, co-chairman of The Weinstein Company — which distributed the film — discusses the decision to re-edit the film for release with a PG-13 rating.

Foreclosure filings in March fell to their lowest level in four years. Some analysts see the market healing and turning around, yet others argue the next wave of foreclosures are just around the corner. NPR's Chris Arnold discusses how housing markets are faring across the nation.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. We don't know much about Saturday's talks in Istanbul between Iran and the group of six major powers, but all sides used positive terms like constructive and agreed to a second round in Baghdad.

While diplomacy continues, the United States warns that the window for talks is closing. There's open talk of preemptive air strikes in Israel, and ever-tightening sanctions continue to squeeze Iran's economy.

In a new book, Relics: Travels in Nature's Time Machine, Harvard entomologist and photographer Piotr Naskrecki documents his travels, from New Guinea to New Zealand and beyond, looking for organisms whose genes can tell us something about conditions on Earth millions of years ago.

How do astronauts take a bath in space? What happens to their sense of smell in a weightless environment? Two NASA astronauts aboard the International Space Station discuss the challenges of life in low Earth orbit and how their research is a stepping stone for future space exploration.

In a new book, To Forgive Design: Understanding Failure, engineer Henry Petroski chronicles disasters from the sinking of the Titanic to the destruction of space shuttles Challenger and Columbia. Petroski discusses why these accidents are often caused by factors other than a design flaw.

From farting fish, to the laws of stupidity, Marc Abrahams (editor and co-founder of The Annals of Improbable Research) has a knack for finding science that "makes you laugh, and then makes you think." Abrahams discusses some improbable research, and why science that might at first seem absurd, matters.

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IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. It's easy to assume that we humans rule the Earth. After all, we can clear-cut forests, we can chop the tops off mountains. We can harvest anything we want from the land or the sea. But before we get too cocky, let's not forget about those other titans of the Earth, the bugs.

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JENNIFER LUDDEN, HOST:

This is TALK OF THE NATION. I'm Jennifer Ludden, in Washington. Neal Conan is away. The man who Florida police first declined to arrest now faces second-degree murder charges for the shooting death of Trayvon Martin. George Zimmerman claims he is not guilty under Florida's Stand Your Ground law, which allows for the use of force in self-defense.

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JENNIFER LUDDEN, HOST: