There is so much FUD, conspiracy, and disinformation surrounding the topic of the hazards of EM radiation to human tissue that it's hard to separate what's relevant from the hyperbolic. Is there a good primer on which frequencies are actually harmful to humans? I seem to remember from studying for my amateur radio license (back in 1990) that the potential harm to a human was based one height and the frequency in question, that the body would act like an antenna and resonate with certain frequencies but in the 5G and Terahertz discussions we're talking about something rather different.