Aloha
I think we all, to some extend, have some concern about these kinds of things. One lesson that was learned too late, was that x-rays are dangerous... It took a fair amount of radiation damage before that was figured out.
While in Germany, I got pretty upset when my wife was expecting our son. The midwife she went to, would do ultrasonography every second week ("the medical insurance pays, so by all means let's have fun and get some good pictures, eh?").
I considered what was happening "horsing around". Ultrasonography does not appear to be dangerous in any way (-that we know of, yet). But that can in no way justify using it as a toy - it is not and a healthy amount of respect shoud be displayed towards new things.
As for the microwave-thing... Your microwave oven works the way it works, because it's designed with a specific wavelength in mind - a wavelength that exite water molecules. It is exploiting quantum mechanical properties, and what I'm trying to imply here (without boring you with details) is that it is far from all microwaves that will hit a wavelength that will exite molecules in your body and thus deposite its energy, there, as heat. If they do, the response would have to be acute and not cumulative (heat doesn't stay - it dissipates).
If there were a danger with microwaves, I suspect we'd know it by now, since they've been in use for generations (short wave radios - you may have used or know someone who's used one as an amateur radio operator. As for myself - with my background in chemistry, I've used microwave spectroscopy in molecular analysis and it is in daily use as such (because of the quantum mechanical response to microwaves by molecules - it makes molecules rotate at defined molecule-specific energies). I've never heard of any side-effects from it by the technicians that operates the spectrometers...).
KD
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