a.T.Edison was the youngest American inventor : he started when he was 16. He became the best scientist of modern times when he invented the light bulb, one of the most important discoveries of all time.
b.ELlen MacArthur borne the world record of the fastest solo voyage around the globe on 7th February 2005. She is the bravest sailor I've heard about. She is also the youngest person to be aired the title of Dame Commader of the Order of the British Empire.
