> Speaking of 'unatural' phenomena - how much
> incidental radiation impinges upon us from
> natural sources and materials that contain
> trace amounts of decaying isotopes ... as
> well as 'cosmic rays' that occasionally
> make their way our direction?
>
> Jim

True - eg UV and radon. And who can say if the
occassional head-on collision between a neutrino
and DNA doesn't lead to all sorts of problems

BTW, I heard that "did we go to the moon" debate
again the other day. One side says that 6ft of lead
shielding would be needed to get through the Van
Allen Belt safely, the other side (NASA) says a tin
can and space suits are sufficient. No figures were
offered on either side to substantiate arguments,
does anyone know ?

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