Podcast: The rise of skeletons, species-blurring hybrids, and getting rightfully ditched by a taxi

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This week we chat about why it’s hard to get a taxi to nowhere, why bones came onto the scene some 550 million years ago, and how targeting bacteria’s predilection for iron might make better vaccines, with Online News Editor Catherine Matacic. Plus, Science’s Alexa Billow talks with news writer Elizabeth Pennisi about the way hybrids muck up the concept of species and turn the evolutionary tree into a tangled web. Listen to previous podcasts [Image: Raul González Alegría; Music: Jeffrey Cook]

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