Cell Phones and Wifi are Perfectly Safe | Office for Science and Society - McGill University
How is it that radio waves can go through concrete and x-rays through muscle? What determines whether photons will pass through without interacting? - Quora
What Is Wifi: Does Cell Phone Radiation Cause Cancer? | Time
Debate Continues on Hazards of Electromagnetic Waves - The New York Times
Electric & Magnetic Fields
Electromagnetic waves and the electromagnetic spectrum (video) | Khan Academy