Last year,a group of South African researchers claimedto have brought a frozen rat’s heart back to life.Theirdiscovery gave new hope to the cryonics movement,which is trying to find ways to preserve human beings sothey can be revived in the future. Last year, a group of South African researchers claimedto have brought a frozen rat’s heart back to life.Theirdiscovery gave new hope to the cryonics movement, which is trying to find ways to preserve human beings sothey can be revived in the future.