It is a recipe for freezing a dead, or nearly dead, person. People who wear this bracelet believe that, if this recipe is followed, the brain and other delicate tissues can be iced without destroying them. A few decades down the line, when nanotechnology has made it possible to be immortal, they hope to be thawed out. John Cantrell and Tom Howard believe that there is a reasonable chance that they will still be having conversations with each other a million years from now.