Uncategorized

  1. Health & Medicine

    In youth hockey, more contact means more injuries

    Concussions are three times more common among 11- to 12-year-olds in leagues that permit checking, a Canadian study finds.

    By Nathan Seppa
  2. Humans

    Secondhand smoke linked to mental distress

    A Scottish survey finds a link between exposure to cigarette smoke and serious emotional problems.

    By Bruce Bower
  3. Planetary Science

    Before the Mississippi, minerals show ancient rivers flowed west

    Michigan zircons uncover the path of an ancient river system across North America.

    By Sid Perkins
  4. Life

    Marine creature cooks up chemical defense from food

    The sea hare transforms a benign algal pigment into a noxious molecule to help ward off crabs and other predators, new studies show.