Leary feels it's probably part of the DNA code that no species will become smart enough to extend its lifespan indefinitely. The average American family today has 1.5 children which goes to show where averages will get you, he says. As more and more power is generated people for some reason decide that they don't want large families anymore. It can't be a coincidence that life extension technology is arriving just at the point where space migration is becoming possible - Leary.

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