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It takes time after vaccination for immunity to the virus to build up, and no vaccine is 100% effective. Plus, scientists don't yet know if the vaccine stops viral spread. Here's what's known so far.
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Black voters in Detroit, Philadelphia, Milwaukee and Atlanta were crucial to Joe Biden's victory. Those are also the places where President Trump's campaign has targeted its legal efforts.
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From heat-related illness to mosquito-borne infections, physicians are seeing the effects of a warming planet in the exam room. There's a growing push to teach doctors-in-training how to respond.