Lauran Neergaard - Associated Press
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A large study finds that people who are more active late at night have poorer overall heart health than the average person. It has to do with the body's internal clock, or circadian rhythm. -
The CDC's overhaul was in response to a request from President Donald Trump to review how peer nations approach vaccines and consider revising U.S. guidance accordingly. -
Millions of people who take aspirin to prevent a heart attack may need to rethink the pill-popping, Harvard researchers reported Monday.
