Most people treat cryopreservation as a binary choice: sign up or don't. But execution quality matters enormously, and you can't evaluate quality without understanding the operational constraints. This topic exists because the physics and biology don't care about your preferences. Ischemic damage accumulates on a fixed timeline, perfusion requires invasive surgery, and cryogenic transport can be challenging. The goal is to make you technically literate enough that "cryopreservation" stops being an abstract concept and becomes a set of concrete procedures you can reason about and evaluate.