Question: who discovered insulin which can be used for medical saver
Answer: Frederick Sanger OM CH CBE FAA ( / ˈsæŋər / ; 13 August 1918 -- 19 November 2013 ) was a British biochemist who twice won the Nobel Prize in Chemistry , one of only two people to have done so in the same category ( the other is John Bardeen in physics ) , the fourth person over all with two Nobel Prizes , and the third person over all with two Nobel Prizes in the sciences .