> OK if this is so, then we should all live at sea level.
> <set sarcasim flag>
> And we all know how many mutants there are in places like Denver
> due to the higher background levels of radiation now don't we.
> <clear sarcasim flag>

        Well, I always thought Elway was too good to be the result of
        natural genetics.  ;)

        But, Norm, your sarcasm is misplaced.  First, there is a distinct
        difference between mutagenesis and carcinogenesis (which your
        "four years of post-graduate studies in Nuclear Physics" should
        have elucidated).

        Second, the relationship between exposure to ionising radiation
        due to altitude and the incidence of various types of cancer and
        birth defects is well documented.  The most extreme example being,
        of course, people who work on aeroplanes in flight.

___Bob