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Researchers Probe Cell-Phone Effects

Cell phones are hot. Some 85 million U.S. residents—30 percent of the population—have joined the mobile-phone revolution.

Still, Americans have been relatively slow to go wireless. Even a decade ago, when U.S. cell-phone use was a rarity, 10 percent of Swedes had taken the wireless plunge, says Maria Feychting of the Karolinska Institute in Stockholm.

Today, Nordic countries remain Western leaders, with 40 percent of Danes, half of Norwegians and Swedes, and almost 60 percent of Finns using cell phones.

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