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How Toenail Clippings Could Catch Nuclear Smugglers

A urine test is the standard way to identify people exposed to nuclear materials, but urine only picks up recent exposure. Scientists say it might be possible to identify exposure within one year based on hair, fingernail, and toenail clippings. […]

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U.S. Kids Gain More Weight During Summer Vacations

More young US children become overweight or obese during summer vacations than during the school year. Researchers examined body mass index (BMI) and obesity prevalence in a nationally representative sample of 18,170 children from the start of kindergarten in 2010 through […]