Edward Jenner more lives than the work of any other human". In Jenner’s time, smallpox killed around 10 percent of the population, with the number as high as 20 percent in towns and cities where infection spread more easily. In 1821 he was appointed physician extraordinary to King George IV, and was also made mayor of Berkeley and justice of the peace. A member of the Royal Society, in the field of zoology he was the first person to describe the brood parasitism of the cuckoo. In 2002, Jenner was named in the BBC's list of the "100 Greatest Britons". Edward Anthony
Edward Jenner of nestling birds in general." Jenner's nephew assisted in the study. He was born on 30 June 1737. Jenner's understanding of the cuckoo's behaviour was not entirely believed until the artist Jemima Blackburn, a keen observer of bird life, saw a blind nestling pushing out a host's egg. Her description and illustration of this were enough to convince Charles Darwin to revise a later edition of "On the Origin of Species". Jenner married Catherine Kingscote (died 1815 from tuberculosis) in March 1788. He might have met her while he and other fellows were experimenting with balloons. Jenner's trial balloon descended