the science and practice of freezing dead bodies or biological material at extremely low temperatures to preserve them for possible future revival.
From Greek 'kryos' (cold) combined with the '-ics' suffix (indicating a field of study), developed as a term in the 1960s when Robert Ettinger popularized the idea in his book 'The Prospect of Immortality.'
The Cryonics Institute and Alcor Life Extension Foundation have actual clients with bodies frozen in liquid nitrogen tanks right now, creating a strange modern form of faith where people bet their afterlife on future science becoming advanced enough to resurrect them.
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