The top picture captures Dr. Zbigniew Religa, a heart surgeon, taking a much-needed break after an epic 23-hour surgery. He's just completed Poland's first successful heart transplant back in 1987. You can spot his assistant catching some Z's in the background, totally wiped out from the marathon operation.

Looking at the bottom photo, we see Tadeusz Zitkevits, the patient who received that pioneering heart, still going strong 25 years after his transplant. He lived until 2017, which means he outlived Dr. Religa by 8 years. The doctor who gave him a second chance at life passed away in 2009.