Natural Antifreeze. Humans have fantasized for years about the time when they would be able to deep-freeze someone and restore him to life sometime in the future. For some frogs, however, this is no fantasy. They do it every year.

Like other animals, frogs are faced with the problem of surviving winter without central heating or hearth fires. Their solution? They “just squat in the open until they freeze solid,” says a report in The Toronto Star. When spring comes around, the frog thaws ...