In future, the air will be filled with nano particles linked to supercomputors, that are activated when they encounter defects in the human body, such as a bad liver. They will then regrow your liver, or etc. Srimad Bhagavatam describes subterranean hi-tech planets where they have conquered death.
Technologically advanced materialistic societies, in which there is minimal spiritual development, most often will kill themselves off. On the other hand, advanced spiritual cultures no longer are interested in the mere hi-tech, they use mystic powers and ultra-high multidimensional "magickal" tech, so we do not generally see materialistic hi-tech and spirituality hand-in-hand.
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