Anja Niedringhaus
A delegate talks on his cell phone during the 63rd World Health conference in Geneva, Switzerland, Monday, May 17, 2010. A major international study suggests that using cell phones for more than 30 minutes each day could increase the risk of glioma, a form of tumor in the brain or spine, according to the study by the World Health Organization's International Agency for Research on Cancer. But the authors added that problems with their research methods prevented them from directly blaming cell phone radiation for the tumor. (AP Photo/Anja Niedringhaus)
