Anita Alvarez and Mariya Koroleva compete in the women's duets synchronized swimming technical routine preliminary on Monday in Rio de Janeiro. Koroleva has suffered several concussions over the years. Al Bello/Getty Images hide caption

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When Swimmers Get Out Of Sync, The Result Can Be A Kick In The Head

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The uptick in serious bike injuries occurred for both male and female cyclists, although more men get in accidents each year. Justin Sullivan/Getty Images hide caption

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As More Adults Pedal, Their Biking Injuries And Deaths Spike, Too

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Closing loopholes in background checks for gun purchases would reduce the risk of death and injury, doctors' and attorneys' groups say. Alexa Miller/Getty Images hide caption

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The round stingray is native to the eastern Pacific coast and is notorious for injuring swimmers and surfers. laszlo-photo/Flickr hide caption

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Mild-Mannered Stingrays Can Inflict A World Of Hurt

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The X-ray reveals a blowdart lodged in a teenager's windpipe. Reproduced with permission from Pediatrics @AAP hide caption

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That flat screen can still be dangerous if it falls off the wall. iStockphoto.com hide caption

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Soda bottles and household chemicals are sometimes used to make low-power bombs. iStockphoto.com hide caption

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