Knowledge Center · mixed_independent_and_provider_context
What is cryonics?
Cryonics is the practice of low-temperature preservation after legal death, oriented toward an uncertain possibility of future recovery. Current science has not demonstrated recovery of a cryopreserved human.
Checked 2026-08-29
Definition and boundary
Cryonics refers to actions after legal death: the body or brain is cooled, processed under an organization’s protocol, and placed into long-term low-temperature storage. Advocates aim to preserve enough biological structure for hypothetical future technologies. The key word is hypothetical: modern medicine cannot recover a person after such storage.
Sources: Society for Cryobiology · checked 2026-08-29
Cryonics is not the whole of cryobiology
Cryobiology is a broad scientific discipline with long-established methods for cells, reproductive materials, and some tissues. Those achievements matter, but they do not make whole-body cryonics reversible. As specimen size grows, new limits appear: solution delivery, temperature gradients, mechanical stress, and uniform rewarming.
Sources: Society for Cryobiology · Nature Communications / PubMed · checked 2026-08-29
Stages described by Providers
Organizations commonly describe advance planning, standby near expected legal death, initial cooling/stabilization, transport, perfusion with cryoprotectant solution, further cooling, and long-term storage. Exact scope varies by organization, location, and case. CWH treats these as provider-described practices, not a demonstrated medical standard.
Sources: Suspended Animation · Alcor Life Extension Foundation · checked 2026-08-29
What the scientific boundary says
The Society for Cryobiology states that the knowledge needed to revive a whole mammal after cryopreservation does not currently exist. This does not prove permanent impossibility, but it is enough to reject wording such as “will be revived,” “likely to return,” or “the technology already works.” The accurate framing is an attempt at preservation under fundamental uncertainty.
Sources: Society for Cryobiology · checked 2026-08-29
How to evaluate claims
Ask who makes the claim, what system generated the evidence, and whether function was actually recovered. A Provider page supports offering terms, not a future outcome. An animal-organ experiment supports that experiment, not whole-human recovery. Good wording preserves the scale of the original evidence.
Sources: Nature Communications / PubMed · checked 2026-08-29