[jfoutz]

Well, X-rays of course. There's a pretty strong case to be made that exposure to uv increases skin cancer rates.

I'm sure you mean the lower frequency stuff though, and yeah, that's probably pretty safe.

[acqq]

Yes, of course, I mean all the waves on the infrared side of the light (those that we call "radio waves") not on the ultraviolet one. And I mean not including heating effects, which are already measured.