|Pittsburth's Safar Center for Resuscitation Research (huh?) scientists have successfully revived dogs after clinical death (i.e. no heartbeat, no brain activity).
The scientsts developed technique that drained the dogs veins of blood and filled with ice-cold salt solution. Three hours later, they replaced the blood and the zombie dogs are brought back to life by an electric shock.
The scientists hope to develop the technique further for use in humans. http://www.news.com.au/story/0,10117,15739502-13762,00.html