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A man named Stan Larkin once hit the headlines by surviving for 555 days without a heart. While waiting for a transplant, the then 25-year-old had to always carry around an artificial heart device in a backpack to pump the blood in his body. In 2016, after finally receiving a heart transplant, Larkin was taken off of the device.
Picture A Man Survived Without A Heart For 555 Days

Image credits: University of Michigan Health System/CNET