radio waves= very weak light waves
The light we see= medium strong light waves
gamma rays = very strong light waves
The difference between light waves, radio waves and gamma rays is their wavelength, not their amplitude. This is what gives them different properties. At big enough amplitudes light and radio waves would be harmful because some of the energy would be absorbed and cause burning. Ultra violet, gamma and x-rays are different because the individual photons have enough energy to dammage molecules (including DNA).

Last I heard the effects of WLAN on the human body have not been fully explored so far and people working near radars get cancer more often, the radar might not kill them directly, but indirectly.
The first part of this sentence is true. The second part has some eviodence to back it up, but would be more accurate if it read "there is some evidence that ..". The third part of sentence is true, but the inclusion of the word might is important. Besides, _Martyr_'s point about other dangers (including being shot) puts these risks in perspective.