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  • Secrets of the Sun With new tools, scientists are striving to better grasp our star and its potentially widely destructive solar storms. Airing May 22 at 9 pm

  • Manhunt—Boston Bombers Which technologies worked—and which didn't—in the race to track down the men behind the marathon attack? Airing May 29 at 9 pm

  • Photographing Climate Change Acclaimed photographer James Balog describes his Extreme Ice Survey, a photographic record of arctic and alpine melting. Learn about the project.

  • Genetic Testing Dilemmas Would you take a test that could tell you more about your future health? Ponder these four scenarios.

  • Are Neanderthals Human? Neanderthals present a conundrum well known in biology: What exactly is a species? Hear from Carl Zimmer.

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