Diseases, Conditions, Syndromes

Mystery still shrouds COVID-19 origin

While many scientists are racing to find vaccines to tame the spread of the coronavirus pandemic, other researchers are probing the past, trying to unravel one of the greatest mysteries of the virus: exactly where it came ...

Psychology & Psychiatry

Sleep problems can lead to teen depression

New evidence suggests that sleep difficulties, long thought to be a symptom of adolescent depression, might actually come first.

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