Talk of the Nation

Your phone knows where you are. Social networks know who your friends are, and what you ate last night. How much of your personal data is really yours to control? Khaliah Barnes of the Electronic Privacy Information Center helps sort out the politics and policies of privacy.

The idea that a comet or asteroid impact led to the downfall of the dinosaurs has been around for years. Now, Paul Renne and colleagues report in Science that they've narrowed down the timing of that collision. It's practically simultaneous with dinosaur extinction.

We spend a lot of time sleeping (roughly one-third of our lives, according to the National Institutes of Health). But how much downtime do our brains really need? Experts discuss the links between sleep, memory and cognition, and why our sleep patterns change as we age.

Toyota and BMW have formed an alliance to work on fuel cell cars. So have Daimler, Ford, and Nissan, with hopes of having cars on the road by 2017. But why now, and what obstacles still stand in the way? Jennifer Kurtz discusses the current state of hydrogen fuel technology.

In 2009, a team of researchers from the British Antarctic Survey stumbled upon some interesting satellite images. Fecal stains showed signs of a huge emperor penguin colony in Antarctica. A team of researchers finally made it out to visit the 9,000-strong colony of emperor penguins in Dec. 2012.

John Brennan, the CIA director nominee, faces questions about the use of drone strikes and torture during his confirmation hearings. In particular, questions will focus on how the U.S. justifies targeted killings in countries where we're not engaged in warfare.

When electorates in Colorado and Washington State voted to legalize recreational marijuana, they thrust their states into uncharted territories. While it's one thing to say pot is legal, it's another to set up regulatory, law enforcement and business practices that work for the industry.

In 5 Broken Cameras, co-directors Emad Burnat and Guy Davidi tell the story of a Palestinian village in the West Bank that is protesting the establishment of an Israeli security wall that cuts villagers off from parts of their land.

NPR's Political Junkie Ken Rudin discuss the week in politics from Ed Koch's passing to Ashley Judd's political future. John Collegio, communications director for American Crossroads, discusses the group's new campaign to beat far right candidates in Republican primaries.

The Supreme Court is expected to rule on two cases involving detector dogs and the limits of reasonable search and seizure. Surrounding the cases are larger questions about the effectiveness of detector dogs and the legal questions that arise when they are used for law enforcement.

FX's new series The Americans is centered around two undercover KGB spies posing as a married couple in Northern Virginia during the Reagan administration. Washington Post TV critic Hank Stuever says this show's characters are just one example of television bad guys that audiences love.

In Searching for Sugar Man, director Malik Bendjelloul tells the story of the search for Rodriguez, an American musician who never made a splash in his home country, but who — unbeknownst to him — became the voice of the liberal, white, anti-apartheid movement in South Africa.

From Iranian President Mahmoud Ahmadinejad's visit to Cairo, to the ongoing violence in Syria, Rami Khouri, columnist for Beirut's Daily Star recaps developments in the Middle East and reflects on lessons learned two years after the Arab Spring.

In the debate on gun control, self-protection and the protection of others are commonly cited justifications for gun ownership. NPR's Neal Conan talks with guests about what happens when a person draws a gun on another individual.

The Pew Hispanic Center estimates that there are millions of people living in mixed-immigration-status families in the U.S. Immigration attorney Kamal Essaheb and Center for Public Integrity reporter Susan Ferriss discuss the challenges these families face.