WASHINGTON: Surgeons have transplanted a pig's heart into a dying man in a bid to prolong his life - only the second patient to ever undergo such an experimental feat. Two days later, the man was cracking jokes and able to sit in a chair, Maryland doctors said on Friday. The 58-year-old navy veteran was facing near-certain death from heart failure but other health problems meant he wasn't eligible for a traditional heart transplant, according to doctors at University of Maryland Medicine. While the next few weeks will...