No it is not THAT harmful, especially through a wall!! Your dad is wrong on this account, sorry to say. As far as rats in server rooms? Well, I'm sitting in a server room right now at work, and we have a small mouse that we call Nathan Scott Phillips, has been here for a few months now (not sure if its the same mouse or not). As far as your research on cell phones, the rads emited by them is miniscule and most claims that cell phones are harmful are generally declared by environmentaly extreme people. The majority of research, in fact, shows there is little evidence to say cell phones are harmful. The select few who have gotten cancer from cell use? Well, gee... what are the odds that they had some malignancy to begin with and a good scape goat would be... voila, the controversial cell phone and of course environmental xtremists will latch on to this and yell to media massess "See!! We were right!!" Also, experiments with lab animals (IE mice exposed to microwaves) is a sham. These rodents were exposed to greater rates and in different than those of cell phone users. Just remember kids, any research can be slanted if you wish it to be, especially when there is another motive/agenda behind it. Be it not completely recreating realistic conditions, or increasing rates of exposure both of which doom sayers have been often found guilty of. That is why you constantly hear of mobile phones being bad. Because of research showing it so, only then to be found out that the experiment was not in conditions similar to the average cell user.