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Podcast for 27 April 2012

April 27, 2012

At the NASA Goddard Spaceflight Center, scientist Donald Wegel explains how the comet harpoon works to Science Update host Bob Hirshon. (Susanne Bard/AAAS)

Why some planets are on the run. How to harpoon a comet. And counting penguins from space.

Transcript

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