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AI has sparked big questions around safety and ethics. OpenAI CEO Sam Altman shares his vision for AI's future and why he thinks the rewards outweigh the risks, live onstage with TED's Chris Anderson.

Computational linguist Jeff Reed figured out how to eavesdrop on wolves in the wild. But he needed help from AI to separate the signal from the noise, and start to decode what each howl means.

Americans have been overconsuming meat for years, says food systems expert Sarah Lake. She wants to help people choose less meat and more plant-based proteins for their health and the climate.

Humans are generating vast amounts of data each day— and we're running out of storage space. Molecular biologist Dina Zielinski discusses a solution that can pack tons of data into a tiny space: DNA.

When host Manoush Zomorodi noticed screens were stealing away her energy, she wanted to figure out why. This led her, and NPR listeners, on a quest to get more movement into their lives.

A new surgery maintains the sensation of limb control after an amputation. When paired with a bionic leg designed by MIT's Hugh Herr, amputees can move and "feel" their limbs like never before.

A remembrance of journalist Maria Emilia Martin, founder of "Latino USA" and well-known teacher and mentor, who died on Saturday.

ALEX AND DANIEL SCHORR TALK ABOUT THE TOP NEWS STORIES OF THE WEEK.

Scott and news analyst Daniel Schorr talk about the week's top news stories.

It's that time of year when best-of lists abound, and Fresh Air's critics get in on the game: David Bianculli chooses his top television shows, David Edelstein names his favorite films, Maureen Corrigan weighs in with notable books and Ken Tucker tunes into to some of the best albums of 2012.