If your kids are under two, turn off all the lights in the room when you put them to bed at night. Don't even leave a night light on, unless you want to increase significantly the chances that your children will grow up nearsighted and have to wear glasses for the rest of their lives. That's the advice issued last week by a group of researchers from the University of Pennsylvania. As someone who has needed glasses since fifth grade, I couldn't believe my eyes when I read their report in the current issue of Nature. It seemed like yet another...
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