Note that <i>cryogenics</i> just refers to the study of very low temperatures, and cryogenic liquids are used in a vast number of scientific and industrial devices.  The topic of the book is more specifically <i>cryonics</i>, the (speculative) preservation of people using low temperature.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cryonics" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cryonics</a>