In the past 100 years, the human life span has increased 65%, to 78 years.

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Will it bring closer the day when biochemistry extends the human life span and makes it healthier and more productive?

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But for many, the evidence that low-calorie diets can extend life has remained tantalizing--especially if, as Walford proposed, it was likely to boost the human life span to 120 years or more.

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But bacteria and viruses breed fast, so natural selection has time, within the span of a human life, to make a difference.

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We are all trying to successfully navigate a world consisting of an infinite data set of human interactions while saddled with a very limited life span.

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Span of life is the scarcity that will govern human interactions and consumer businesses.

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