New machines that have brought people back to life who've been "dead" for more than 40 minutes.

"A new mechanical CPR technique being tested in Australia is being credited with saving the lives of three people who were clinically dead for more than 40 minutes. The technique uses two machines: One, called an AutoPulse, keeps up a constant stream of compressions (far stronger and more consistent than a human can), while the second, a portable heart-lung machine, pumps blood to the vital organs and brains."