One of the most common concerns that cell phone users have is the possible health risk that could occur as a result of cell phone use. Cell phones are typically placed against user's head and ear in a telephone conversation. This position makes it possible for a portion of the radiation to be absorbed by human tissue because all cell phones emit some electromagnetic radiation. Given the close proximity of the phone to the head, it is possible for the radiation to cause a certain degree of harm to the user. What is being debated in scientific and political realms is just how much radiation is considered unsafe, and the existence of any potential long-term effects of cell-phone radiation exposure.