Despite the fact there are no studies showing that Wi-Fi causes health problems, worries persist. Despite new studies showing that there is no link between wireless phone use and cancer, worries persist. The Times On-line (via Wi-Fi Networking News) compares persistent fears surrounding both technologies, and notes that a year of Wi-Fi exposure equals twenty minutes of cellphone use. "If wi-fi should be taken out of schools (which has happened both at high-schools and Universities), then the mobile phone network should be shut down too—and FM radio and TV, as the strength of their signals is similar to that from wi-fi in classrooms," says Dr. Michael Clark.