Why cell phones may be more dangerous than we think

[Commentary] No one knows for sure whether cell phones are a health hazard. Several players at the heart of this debate converged on San Francisco last week. CTIA-The Wireless Association had its annual trade show, which it promised would be the last in the city because of the new disclosure law. There were several protests outside the event. And noted epidemiologist Devra Davis, a visiting professor at Harvard University, arrived for several speaking engagements about her recently published book, "Disconnect: The Truth About Cell Phone Radiation, What the Industry Has Done to Hide It, and How To Protect Your Family." For many years it was believed the low levels of radiation generated by cell phones and towers had no effect on human biology. Now a small but growing number of scientists and health activists are challenging those findings.