91.   Why is the human heart so hard for researchers to imitate?

92.   Artificial hearts are widely used to keep people on waiting lists for transplants alive while waiting for a new human heart.

93.   At present, human hearts have to be transplanted within hours of being taken from a donor.

94.   At least six labs have been searching for a way to manipulate pigs so their organs could be used to replace ailing human hearts, lungs and livers.

95.   Barnard predicted that someday human hearts will be grown artificially to suit patients, using genetic engineering techniques that can already produce human skin.

96.   Because the initial research was on animal hearts, there had been speculation it could lead to human hearts being stored for transplant.

97.   Barnard predicted that someday human hearts will be grown artificially to suit patients, using genetic engineering techniques that already can produce human skin.

98.   But working with human hearts can break your own.

99.   Christiaan Neethling Barnard, a South African doctor who performed the first successful human heart transplant, dies after suffering an asthma attack in Paphos, Cyprus.

100.   Challenging generations of medical lore, researchers have found striking new evidence that the human heart can repair itself.