If you still believe RF radiation is completely harmless within FCC approved exposure limits, consider this:
Current FCC exposure limit in the US:
580 microW / cm^2 = 5.8 W/m^2
Current exposure limits in Russia for the 0.3-178.4 GHz frequency band (as reported by a friend of mine from Russia who works as a telecommunications engineer on cell phone towers and other types of RF equipment):
0.1 W/m^2 - for 24 hours at the most
0.1-1 W/m^2 - for no more than 2 hours
1-10 W/m^2 - for no more than 10 minutes
You may also want to know why Microwave ovens were banned in Russia in 1976 and read Dr. Mercola's Ten Reasons to Throw out your Microwave Oven.
For even more information check Wireless Networks (Wi-Fi): Consumer Health and Safety Advice.
There you go, scientific evidence as requested.