Concerns over the effects of cellphone radiation have surfaced again in Washington, with Sen. Tom Harkin (D-Iowa)'s pledge Monday to look more into the potential health dangers for users.

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The revived debate will take on new complexity as youth make up a larger portion of cellphone users. More teens have cellphones than ever, according to an August study by the Pew Internet Project; 71 percent of teens ages 12 to 17 used cellphones in 2008, compared with 45 percent in 2004.

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