On 3 December 1967, two brothers carried out the world's first heart transplant operation. Christiaan and Marius Barnard were both working as surgeons in Cape Town, South Africa. Christiaan Barnard led the team which carried out the transplant. In 2009 Marius Barnard spoke to Witness about the operation, and about his relationship with his older brother.

(Photo: Leader of the heart transplant team Christiaan Barnard. Credit: Press Association)