An Australian man who has been donating his extremely rare kind of blood for 56 years has saved the lives of more than two million babies. James Harrison, 74, has an antibody in his plasma that stops babies dying from Rhesus disease, a form of severe anaemia. He has enabled countless mothers to give birth to healthy babies, including his own daughter, Tracey, who had a healthy son thanks to her father's blood. Mr Harrison has been giving blood every few weeks since he was 18 years old and has now racked up a total of 984 donations. When he...