Everyone agrees that Leonardo da Vinci (1452-1519) was one of the greatest of all painters. His painting "The Last Supper" is probably the most famous painting in the world. But Leonardo would be famous if he had never painted a stroke. For he was also a great inventor. He invented the military tank, and roller bearings. He made plans for dozens of weapons and machines. He even experimented with airplane and submarine modes. Besides, Leonardo was great as a scientist and engineer. He was also a poet, a musician, and a sculptor. Perhaps no other person in history has ever learned so much in a lifetime. Certainly no one ever deserved more to be called a genius.