The American Cryonics Society (ACS), also known as the Cryonics Society of America, is a member-run, California-based, 501(c)(3) tax-exempt nonprofit organization that supports and promotes research and education into cryonics and cryobiology. Cryonics is the preservation through cold storage, usually with liquid nitrogen, of humans (and sometimes non-human animals) after legal death. This procedure is done in the hopes of eventual "reanimation." Any such reanimation depends upon future technological advances that are hoped for, but by no means assured or promised.