The co-discoverer of stem cells died on January 20th, aged 84

Professor Ernest McCulloch, who died on January 20, 2011 aged 84, was a medical researcher who, with James Till, identified what we know today as stem cells; such is the importance of the cells that some have likened McCulloch and Till to Watson and Crick – the duo who discovered DNA. *Read his obituary in The Telegraph:
http://www.telegraph.co.uk/news/obituaries/medicine-obituaries/8331783/Professor-Ernest-McCulloch.html