Scientists have tested a procedure that brings dogs back to life after they have been clinically dead for several hours. Developed at the Safar Resuscitation Center(1), the technique involves draining the canine's blood and then filling the veins with an ice-cold salt solution. Later, after the blood is replaced, the dogs are jarred back to life with an electric shock. The center is hopeful that the procedure will work on humans as well. Read more here(2).

1. http://www.safar.pitt.edu/
2. http://www.news.com.au/story/0,10117,15739502-13762,00.html