What is this wi fi anyway, I mean what
type(frequency) of signals are used in wi-fi? Radio?

The reason that I ask, is because i wonder if
completely saturating a city in wi-fi poses any
adverse health risks.

I worry about his after reading an article about
some researcher creating a "god helmet"

The article,
www.geocities.com/satanicus...elmet.html
describes a helmet that uses electromagnetic signals
to stimulate an emotional response in it's wearer.

When queried as to why he does this research, one of his answers
was, "We're living more and more in a complex electromagnetic environment where the experiences of the effects may not be obvious."

So i wonder how much the wifi revolution will change
the amount of EM waves i'm exposed to and whether
it actually makes a difference.

Any facts, ideas or theories?

Well, if wi-fi really does start to mess with
our brains and cause all of us to be emotionally
unstable, then at least we'll all be able to connect
to tribe and talk about it from the comfort of our own
couches, car seat, coffee shop, etc. :-)