Wireless Worries

This is the largest biological experiment in the history of the world," shouts Leif Salford, an unusually animated neurosurgeon at Lund University, in Sweden. Salford's not talking about his own work. He's talking about the 1.3 billion people around the world who regularly chat away on their mobile phones, "freely pressing radiological devices to their brains."

Salford's own research involves much smaller samples — of mice, not men — but it is raising big questions about the safety of human mobile-phone use. In a paper that will be published in April by the U.S. journal of the National...

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