A self-described science nerd is the latest American to get an experimental pig kidney transplant. Doctors at Massachusetts General Hospital announced Monday that Bill Stewart of Dover, New Hampshire, is faring well after his June transplant. It's not the only milestone they're marking in the quest to prove if animal-to-human organ transplants might really work. An earlier Mass General patient has been dialysis-free for a record seven months and counting thanks to a pig kidney. Based on those successes and lessons from some other attempts, U.S. health officials have cleared the first clinical trials of pig xenotransplants.

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• August 2004: Apple CEO Steve Jobs discloses that he had been diagnosed with — and cured of, through surgery — a rare form of pancreatic canc…