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...crisis in the brain," says David Hovda, director of the Brain Injury Research Center at UCLA's David Geffen School of Medicine. "A second concussion will cause such an energy demand that it will overwhelm the survival capability of the brain." (See the Year in Health, from A to Z...
...underwent gastric-bypass surgery. The team found that each group harbored a different intestinal zoo of microbes and that following their surgery, the gastric-bypass patients' gut bugs ended up looking much more similar to those of the normal-weight patients. (See the Year in Health, from A to Z...
...autism. That's what led Baron-Cohen to regard the disorder - which is about three to four times as prevalent in boys as in girls - as one of the extreme male brain and to search for a link to male hormones. (See "The Year in Medicine: From A to Z...
...study - which included 7,688 patients in eight hospitals around the world - saw death rates drop from 1.5% before the checklist was instituted to 0.8% afterward. Serious complications fell from 11% to 7%. Study sites included Seattle, London, Toronto, New Delhi, and Ifakara, Tanzania. (See TIME's A-Z Health Guide...
...TIME's Year in Health from A to Z...