DURATION: 4 minutes
DIFFICULTY: Moderate
Cryonics is the low-temperature perservation of people who cannot be sustained by contemporary medicine, with the hope that resusciatation and restoration to full health may be possible in the far future.
Cryopreservation of humans is not reversible with present technology; cryonicists hope that medical advances will someday allow cryopreserved people to be revived.