Podcast: Microbes in the Clouds, Sensing 'Infrasound,' and Surviving Siberia

What are bacteria doing kilometers above Earth's surface? Do pigeons "see" sound? And how have humans evolved to ultracold climates? Science's Online News Editor David Grimm chats about these stories and more with Science's Sarah Crespi.

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A 3D plot from a model of the Ebola risk faced at different West African regions over time.
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