Is it safe for kids to use cell phones? I've heard they up the risk of brain tumors.

Unfortunately, we really don't know why these tumors happen. Epidemiologists and scientists who study causes of brain tumors have looked at things like cell phones and power lines and they haven't found a clear association. For now, I put my money where my mouth is and let my 11-year-old son have a cell phone, although he mainly uses it to text.

Adam S. Levy, MD, director, pediatric neuro-oncology, The Children's Hospital at Montefiore

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