Podcast: Ancient Sea Creatures, Limiting Your Friends, and Living Bridges

What did ancient sea creatures really look like? Is there an upper limit to how many friends we can have? And how do fire ants form living bridges? 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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