Christiaan Barnard, Ludvik Svoboda, Jan Navratil, Prague Castle
Czech cardiac surgeon Jan Navratil, centre, introduces Christiaan Barnard, left, South African cardiac surgeon who performed the world's first successful human-to-human heart transplant, to Czechoslovak president Ludvik Svoboda as he meets participants of international heart transplant conference at Prague Castle, September 11, 1969. CTK Photo/Josef Nosek