A screen displays a visualization of the study field of the winners of the 2014 Nobel Medicine Prize on October 6, 2014 at the Karolinska Institutet in Stockholm, Sweden. British-American researcher John O'Keefe jointly won the Nobel Medicine Prize with Norwegian husband and wife team, Edvard I Moser and May-Britt Moser, for discovering an inner GPS system in the brain.      AFP PHOTO / JONATHAN NACKSTRAND        (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)