history of science is filled with the lives and legends of men and women who have made huge leaps forward in our knowledge and understanding. These people have made contributions that reverberate for centuries and their names have become synonymous with the science and the ideas that they created:Copernicus, 1514: The sun does not move. earth is not in the center of the circle of the sun, nor in the center of the universe.Galileo, 1609: A large magnifying lens should be employed to study the surface of the moon and other heavenly bodies.Isaac Newton, 1679: Every weight tends to fall towards the center by the shortest possible way.Charles Darwin, 1856: Man does not vary from the animals except in what is accidental.These are the names we have attached to each of these world-changing ideas, but none of these quotations came from the men who are credited with the con- cepts they describe. In fact, all are from the notebooks of Leonardo da Vinci (1452--1519), predating by decades or centuries the great men who would fully define the ideas.How can any single person have thought so insightfully about so many different areas of science?Leonardo of the city of Vinci in Italy was one of the most prolific polymaths recorded in human history. He was an accomplished painter, sculptor, architect, musician, mathematician, engineer, in- ventor, anatomist, geologist, cartogra- pher, botanist, and writer. He worked as an artist for the Medici in Florence, Corvinus in Hungary, and Pope Leo X; a civil engineer for Ludovico in Milan and Ottoman Sultan Beyazid II in Constan- tinople; a military architect in Venice; a cartographer for the family of Pope Alexander VI; an anatomist with Mar- cantonio della Torre in Pavia and Padua; and finally, as a military and civil engi- neer for Francis I of France, who cap- tured Milan and took Leonardo back to France as a valuable trophy of war.He was able to jump between all of these fields to make valuable contribu- tions when they were still young sci- ences. He lived at a time when the social and professional boundaries between the disciplines were just beginning to be erected; it was not clear where one field ended and the other began, so there was nothing to prevent an agile mind from crossing back and forth between them.Leonardo was certified as a master in the Guild of St. Luke-which cre- dentialed both artists and doctors of medicine-at the age of 20, after a six- year apprenticeship, but he was not a man to define himself by the boundaries of a guild. For most people, early train- ing in a specific guild would define their life's work, focusing their contributions in a single field. For Leonardo, art was just a foundation, a tool for growing into other areas. He bridged the gap from one profession to another when it suited his curiosity and his insights. In his own words,I roamed the countryside searching for answers to things I did not un- derstand. Why shells existed on the tops of mountains along with the imprints of coral and plants and seaweed usually found in the sea. Why the thunder lasts a longer time than that which causes it, and why immediately on its creation the lightning becomes visible to the eye while thunder requires time to travel. How the various circles of water form around the spot which has been struck by a stone, and why a bird sustains itself in the air. These questions and other strange phenomena engage my thought throughout my life.Amazingly, he seems to have been unique in this exploration. Historical records do not include drawings and inventions by other artists intent on changing the world. It seems that his peers stuck to their painting and left engineering and inventions to the craft guilds of carpentry, waterworks, and armorers.By contrast, Leonardo seems to have deployed his formal training as an artist to support his scientific imagination. …
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