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Conrad,
Have a look at Strawman's code (in IE click View/Source). The bit you are interested in is in the routine " function muslimPopulationCrunch()". Imagine that the actual population is declining, on the way to extinction (the dodo scenario). The 1/80 rule means that will never happen - now matter how small the poulation only 1/80 will ever die. In a declining population the death rate should be higher than a single fraction of the average longevity. And vice-versa for an expanding population. The population is expanding due to births, but the death rate of 1/80 assumes the age spread is unchanged, ie, those babies were born at an even spread of ages. The death rate should be lower than that fraction for expanding populations. I defer to your superior wisdom in defining population dynamics as simplistic "first year biology" stuff. Myself I am still coming to grips with some of the real fundamentals - the number line fascinates me. And in computing I am still really exploring the possibilities offered by various combinations of sequence, iteration and branch statements. I guess these are both "first year schooling" things ...
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