XMRV, a mouse virus, may be an artifact of laboratory experiments rather than the cause of chronic fatigue syndrome. Whittemore Peterson Institute hide caption

itoggle caption Whittemore Peterson Institute

A Washington man talking on his cellphone may be taking a health risk, according to an analysis from the World Health Organization that finds a possible risk of cancer from exposure to the devices. Nicholas Kamm/AFP/Getty Images hide caption

itoggle caption Nicholas Kamm/AFP/Getty Images

Being overweight or obese is a big risk factor for hypertension. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A study found that women's bones didn't benefit from consuming more than 750 milligrams of calcium a day. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Actor Jessica Alba, accompanied by Sen. Frank Lautenberg (D-NJ), reacts when a buzzer calling for a vote goes off during a news conference on Capitol Hill Tuesday about chemical regulation. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP