Boston.com / Business / Technology / Long-term health risks remain unclear: "Parents should think twice before giving in to a middle-schooler's demands for a cellphone, some scientists say, because potential long-term health risks remain unclear.
When you use a cellphone, 70 to 80 percent of the energy emitted from the antenna is absorbed by the head, Lai said.
He also said that because brain tumors usually take 30 to 40 years to develop, children who use cellphones from their teen years onward would have a longer period of time to see a cumulative impact."
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