The fundamental nature of cryonics renders it practically untestable. Nobody has ever made an attempt to revive a preserved human. A living being can be chilled to the point of appearing to be dead before being revived, according to researchers working on "suspended animation," but freezing a body for decades is another story.
More experiments on the preservation of cells, tissues, and even worms have been conducted, but scaling those results up to a complete human body isn't a simple task. The cryopreservation industry is very popular among futurists. The basic assumption is straightforward: medical technology is improving all the time. Those who pass away today might be treated tomorrow.
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