On excessively hot days, there are more likely to be fatal car accidents and food safety problems, and police officers and government food inspectors tend to do less of their duties, according to a study published Monday in the Proceedings of the National Academy of Sciences.

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An app designed to track fertility and prevent pregnancy in women 18 and older is the first to win US Food and Drug Administration approval to be marketed as a contraceptive, the agency announced Friday. The Natural Cycles app was approved as part of the agency's new Digital Health Innovation Action Plan, designed to fast track approval for new low-to-moderate-risk devices.

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A man in Paris has become the world's first to successfully receive two facial transplants.

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Andy Sandness received a face transplant, and now he's meeting the donor's family for the first time. If you or someone you know is showing warning signs of suicide, contact the National Suicide Prevention Lifeline at 800-273-TALK.

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For photographer Allan Hailstone, 1950s Berlin had an irresistible attraction.

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Patrick Hardison can now drive his children to school in the morning. He can swim in a pool, run his fingers through his hair and blink his eyes.

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Go inside CNN's coverage of the fall of the Berlin Wall in 1989:

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CNN's Fred Pleitgen searches for remnants of the Berlin Wall, once an iconic symbol of the Cold War.

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