Pet microchips are supposed to ensure recovery of your lost animal. But these chips have received as much opposition as they have praise. Find out when the devices work and when they fail.
On July 2, 2001, heart failure patients gained new hope, as surgeons performed the first artificial heart transplant in nearly two decades. The AbioCor Implantable Replacement Heart is the first completely self-contained artificial heart and is expected to at least double the life expectancy of patients. See more »