Olle Johansson, PhD discusses the evidence of adverse health effects from electromagnetic radiation, including wifi and cell phones.
He explains how there are over 25,000 studies about the health effects of radiation, and there have never been that many studies which are all wrong at the same time.
There is also a very telling trend of insurance companies and manufacturing companies having explicit legal clauses explaining that they are not responsible for any health effects of radiation from the use of their products. For instance, cell phones warn that they should not be within an inch of your body, which means you have given up any rights to sue the companies for eventual adverse health effects as soon as you touch your phone.