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PREDICTIONS – 10 Years Later - Santa Fe Institute

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1. SCIENCE AND FORETELLING<br />

ever the size, ... the mammalian heart seems to be good for a billion<br />

beats and no more.” 8<br />

For hundreds of thousands of years humans had a life expectancy<br />

between twenty-five and thirty years. With the normal rate of seventytwo<br />

heartbeats per minute, they conformed nicely to the one billion invariant.<br />

Only during the last few hundred years has human life<br />

expectancy significantly surpassed this number, largely due to reduced<br />

rates in infant mortality from improved medical care and living conditions.<br />

Today’s humans reach three times the mammals’ quota,<br />

positioning Homo sapiens well above the animal world. Are we finally<br />

making progress in our evolution as a species?<br />

“On the contrary, we are regressing!” exclaims Marchetti in his usual<br />

playing-the-Devil’s-advocate style. Life expectancy at birth increased<br />

primarily because infant mortality decreased. But what also increased at<br />

the same time was the availability and acceptability of safe and legal<br />

abortions, resulting in a rise of prenatal mortality, thus canceling a fair<br />

amount of the life expectancy gains. The end result, he says, claiming to<br />

have seen the data that substantiate it, is that life expectancy at conception<br />

is still not much above forty.<br />

If there is any truth in this, we are back—or close enough—to the<br />

one-billion-heartbeat invariant, but with an important difference. Low<br />

infant mortality rates result in the birth of many individuals who may be<br />

ill-suited to survive a natural selection process favoring the fittest. At<br />

the same time, abortions are blind. They eliminate lives with no respect<br />

to their chance of survival. A selection at random is no selection at all,<br />

and the overall effect for the species is a degrading one.<br />

With life expectancy defined at conception, the one-billion-heartbeat<br />

invariant seems to still be roughly in effect for humans. From now onward<br />

there can be no significant further gains in infant mortality rates<br />

because they are already quite low. Moreover, as we will see in Chapter<br />

Five, the overall death rate has practically stopped decreasing. All this<br />

argues for bleak forecasts about life-expectancy growth. There may be a<br />

message for us coded in the one-billion-heartbeat invariant. According<br />

to the Bible we are now reaching the upper limit in life expectancy: 9<br />

Seventy years is all we have—eighty years, if we are strong; yet all<br />

they bring us is trouble and sorrow; life is soon over, and we are<br />

gone. (Psalm 90:<strong>10</strong>).<br />

34

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