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Researchers describe a cellular circuit that helps the brain remember which environments are safe and which are harmful--and what can happen when that circuitry is disrupted.

A dermatologist in Vietnam travels to New York for a six-week Columbia tutorial to become the only person in her region of the country qualified to interpret skin biopsies.

A new study has revealed that cholesterol-lowering statins may help reverse the mechanisms that increase the risk of heart disease in people with sleep apnea.