Australian James Harrison, 74, has donated blood 984 times so far. While the sheer number of his donations is admirable, what makes Harrison’s story special is that he has a very rare type of blood containing a unique antibody which is used to save the lives of babies with Rhesus disease.

The ‘man with the golden arm’ as he is aptly named is thought to have saved 2.2 million babies so far, including his own grandson. Harrison volunteered to undergo countless tests in order to help researchers develop the Anti-D vaccine.