A cell phone is like a small radio receiver and transmitter. The so-called impact on human health is mainly focused on the emission of radio waves. These waves contain the electromagnetic radio frequency spectrum, just like microwave ovens and airport radar, but microwave ovens do not affect the human brain, and the strength of the radar signal contacting the human body is also very small. A cell phone emits no more than 0.6 watts of energy, except that it is directed at the user’s head. Microwaves heat up objects, which is why microwave ovens can cook. But the heat generated by a cell phone is insignificant. John Mould, a professor of radiation oncology at the Medical College of Wisconsin in Milwaukee, says, “If there are any biological effects of cell phones, they are not caused by heat, but by the electromagnetic waves produced by radiation. Just as X-rays and ultraviolet radiation from sunlight may cause cancer risk which, because it can damage the body’s deoxyribonucleic acid, also known as DNA,” the researchers believe that if cell phones do have this effect, it must be detected, but now not so. Professor Molde said, “The current extensive publicity on this aspect of the study is limited only to the use of cell phones in question, and more often cited is not the main finding of this study.” In fact, numerous investigations have shown that there is no necessary link between cell phones and brain tumors. Recent researchers at the Massachusetts Institute of Epidemiology, funded by cell phone manufacturers, compared the causes of disability in two groups of people. One group consisted of drivers who regularly used cell phones, and the other group was the same number of drivers who used car phones with antennas in the canopy, meaning that the latter were not exposed to microwave radiation. The results of the investigation showed that there was no difference in cancer disability between the two groups. Another study came from the American Health Foundation. Researchers there compared more than 450 patients hospitalized for brain tumors with the same number of patients hospitalized for other diseases and found no correlation between cell phone use and brain tumors, although a small percentage of brain tumor patients were cell phone users. Nonetheless, the National Cancer Institute is currently conducting further research into the dangers of cell phone use and the idea that it causes cancer in humans. At the same time, in order to alleviate the concerns of cell phone users, some of the major cell phone manufacturers have made the decision, starting this fall, to indicate on the box of the cell phone the specific data of the phone’s radiation intensity (SAR) to indicate how much energy the human body can absorb from the phone itself, the size of this data depends mainly on the placement and design of the phone’s antenna. The FDA also recommends that, for safety reasons, which are still using the old analog phone users are best replaced with digital phones.