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Awareness of our mortality and imperfection has given rise to countless beliefs and continually drives scientific research into human rejuvenation. In different forms, people strive for spiritual immortality in heaven, physical immortality on earth, or the possibility of improvement here and now. Secular philosophers and scientists search for ways to radically extend life, science fiction writers debate the future of humanity, utopian dreamers try to create ideal conditions for it, pessimists predict the collapse of civilization, while dictators and demagogues exploit all these fears.