If it works, he says, you will still die, but you could get to a hundred and twenty being pretty healthy, then fail quickly. Human obsolescence? He is thinking about establishing a group to prepare for our eventual successor, whether it be an A.I. or an enhanced version of Homo sapiens. The idea would be to assemble thinkers in robotics, cybernetics, quantum computing, A.I., synthetic biology, genomics, and space travel, as well as philosophers, to discuss the technology and the ethics of human replacement. For now, leaders in those fields are meeting semi-regularly at Altmans house; the group

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