Edward Jenner

Edward Jenner was born, May 17th, 1749 in England. When he was a boy he apprenticed to a surgeon and studied medicine briefly before returning to his small town a opening his own medical practice in 1792.
He researched smallpox to discover a cure. One thing he did notice, was that milk maids who had been exposed to cowpox did not get smallpox. A young boy named James Phipps, was infected with cowpox, to prove his theory, Jenner started a process called, "vaccination."
He proved that you body can become immune to something and fight it off.