The Science breakthrough of the year, readers' choice, and the top news from 2015.
Dec 17, 2015•40 min•Transcript available on Metacast Episode description
Robert Coontz discusses Science's 2015 Breakthrough of the Year and runners-up, from visions of Pluto to the discovery of a previously unknown human species. Online news editor David Grimm reviews the top news stories of the past year with Sarah Crespi. Hosted by Susanne Bard.
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