Man is an artifact designed for space travel. He is not designed to remain in his present biologic state any more than a tadpole is designed to remain a tadpole.

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I think that everyone at any age should ask themselves 'where do I want to be today where do I want to be tomorrow and where do I want to be in a hundred years?' We all have clear answers to those questions. We only have so much time. It's a real shame if we don't spend our lives trying to do that.