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Earth, Mars and Venus all looked pretty similar when they first formed. Today, Mars is dry, cold, and dusty; Venus has a hot, crushing atmosphere. Why did these sibling planets turn out so different?
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It is unclear why the suggested rule was not released by its intended deadline. But a spokesperson for the federal agency told NPR that its implementation "continues to be a high priority."
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Federal regulators are trying to prevent bad actors from switching unknowing consumers' Obamacare coverage. Their fixes risk making enrollment so cumbersome that people won't want to sign up.
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Every spring, a remarkable sight unfolds in the San Gabriel Mountains north of Los Angeles, as thousands of songbirds fly north.
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Climate journalist Zoë Schlanger says research suggests that plants are indeed "intelligent" in complex ways that challenge our understanding of agency and consciousness. Her book is The Light Eaters.
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Boeing's Starliner program has been plagued with delays and design problems for several years.
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Some doctors are promoting propellant-free inhalers over puff inhalers that emit greenhouse gases. Climate change can exacerbate respiratory ills because of more fires, air pollution and allergens.
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NASA Administrator Bill Nelson told NPR he sees the U.S. in an urgent race with China to find water on the moon, and that he trusts SpaceX, despite Elon Musk's increasingly controversial profile.
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A father and daughter discovered fossil remnants of a giant ichthyosaur that scientists say may have been the largest-known marine reptile to ever swim the seas.
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Mammograms should start at age 40, according to the U.S. Preventive Services Taskforce. And a new study finds hormone therapy for menopause symptoms is safe.
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NPR's Ayesha Rascoe talks with Forbes senior healthcare contributor Bruce Japsen about why Walmart is closing 51 health clinics and what this means for the rural populations they served.
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Cargill says that, out "of an abundance of caution," it is recalling several of its ground beef products produced in late April and sold at Walmart locations across the eastern U.S.