"Even if you have only a one in a thousand chance of that coming about, I would say it's worth it," he says. "If somebody comes up with a figure after considering all these possible objections and counter objections, that is anywhere like one in 100 or one in 10,000." If we were able to revive someone who had been cryopreserved several hundred years ago, for example, they'd be out of sorts -- but still want to stay alive.

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