Ars Technica has a really interesting article about the fabled proximity sensory in the iPad 3G. I know what you're thinking: "Why does the iPad 3G have a proximity sensor?" Well, if Ars did a proper job at finding and interpreting FCC papers (as I believe they did) it's there to protect users from electromagnetic radiation that emanates from the iPad's 3G antenna. Since distance affects how much radiation is absorbed by a person's
