(Charles Platt is a guest blogger)
Alcor Foundation, the larger of two companies that maintain people in cryopreservation, stores cryopreserved bodies, heads, and pets in beautifully made stainless-steel cylinders known as dewars. These are vacuum-insulated (like giant thermos flasks) to minimize the boiloff of liquid nitrogen. Each whole body is packed in a separate aluminum pod, four pods to a dewar. The upper ends of the pods are visible in the picture on the right, which I took looking down into the mouth of a dewar through the liquid nitrogen, which is colorless. A winch and chain are used to lower pods into storage.
For more information check www.alcor.org