a pig s heart in a human being. for the first time ever, a man with a terminal heart disease has received a transplant from a genetically modified pig, a pig s heart. 57-year-old david bennett is doing well four days after the transplant according to the maryland school of medicine. his options were either death or roll the dice on the experimental procedure. joining us now, dr. jonathan reiner, cnn medical analyst and professor of medicine and surgery at george washington university. when i read the headline, a pig heart in a human being, k i wa like, nothing else matters. nothing else matters today. how big a deal with this? potentially a really big deal, not just for heart transplant patients but for the 100,000 or so folks who are on the waiting list now for other kinds of organ transplants in the united states. so there are a lot of people waiting for organs.