keen intellect and curiosity about a wide variety of subjects. He believed in the accumulation of direct knowledge and facts through observation. Leonardo da Vinci thought sight was humankind’s most important sense and eyes the most important organ. Leonardo began to study anatomy seriously. His drawings of a fetus in utero, the heart and vascular system, sex organs and other bone and muscular structures are some of the first on human record. In addition to his anatomical investigations, da Vinci studied botany, geology, zoology, hydraulics, aeronautics and physics. He sketched his observations on loose sheets of papers and pads that he tucked inside his belt. He placed the papers in notebooks and arranged them around four broad themes-painting, architecture, mechanics, and human anatomy. His ideas were mainly theoretical explanations, laid out in exacting detail, but they were rarely experimental. Countless sketches describe that Leonardo had found out the basis for many inventions that were understood hundreds of years after his death. His versatile and originative nature was born of a desire to promote creativity. He also wrote about making a telescope to view the moon. Most of Leonardo’s sketches and paintings depict a scientific phenomenon with an artistic and creative approach. On the other hand, his anatomical findings, including information about the structure of muscles and blood vessels, were surprisingly precise. Leonardo also planned to create a mechanical flying machine. Leonardo discovered that flying, contrary to the popular notion, by attaching a pair of wings to a person’s arms and then flapping them like a bird, is simply not possible. He concluded that by using levers, the wings of a flying structure could be controlled. Leonardo also created a sketch of an early helicopter that even featured a preventive parachute. When France attacked Italy in 1944, Leonardo came back to Florence after the subsequent downfall of the Duke of Milan.
The full extent of his scientific studies has only became completely recognized in the last 15 years. Many of his designs, such as the movable dikes to protect Venice from invasion, proved too costly or impractical. Some of his smaller inventions entered the world of manufacturing unheralded. As an engineer, Leonardo conceived ideas vastly ahead of his own time, conceptually inventing an improved version of the helicopter, an armored fighting vehicle, the use of concentrated solar power, a calculator, a rudimentary theory of plate tectonics and the double hull. In practice, he greatly advanced the state of knowledge in the fields of anatomy, astronomy, civil engineering, optics, and the study of water. Leonardo's most famous drawing, the Vitruvian Man, is a study of the proportions of the human body, linking art and science in a single work that has come to represent Renaissance Humanism. He was also exposed to a very wide range of technical skills such as drafting, set construction, plasterworking, paint chemistry, and
metallurgy. Leonardo da Vinci was profoundly observant of nature, his curiosity having been stimulated in early childhood by his discovery of a deep cave in the mountains and his intense desire to know what lay inside. He particularly liked geology and hydrology. As a scientist, Leonardo had no formal education in Latin and mathematics and did not attend a university. Because of these factors, his scientific studies were largely ignored by other scholars. Leonardo's approach to science was one of intense observation and detailed recording, his tools of investigation being almost exclusively his eyes. His journals give insight into his investigative processes. During the Renaissance, the study of art and science was not perceived as mutually exclusive; on the contrary, the one was seen as informing upon the other. Although Leonardo's training was primarily as an artist, it was largely through his scientific approach to the art of painting, and his development of a style that coupled his scientific knowledge with his unique ability to render what he saw that created the outstanding masterpieces of art for which he is famous. A recent and exhaustive analysis of Leonardo as a scientist by Fritjof Capra argues that Leonardo was a fundamentally different kind of scientist from Galileo, Newton, and other scientists who followed him, his theorizing and hypothesizing integrating the arts and particularly painting. Capra sees Leonardo's unique integrated, holistic views of science as making him a forerunner of modern systems theory and complexity schools of thought. Leonardo kept a series of journals in which he wrote almost daily, as well as separate notes and sheets of observations, comments and plans. He wrote and drew with his left hand, and most of his writing is in mirror script, which makes it difficult to read. Much has survived to illustrate Leonardo's studies, discoveries and inventions. On his death, his writings were left mainly to his pupil Melzi with the apparent intention that his scientific work should be published. This did not take place in Melzi's lifetime, and the writings were eventually bound in different forms and dispersed. Some of his works were published as a Treatise on Painting 165 years after his death. He continued work on his scientific studies until his death; his assistant, Melzi, became the principal heir and executor of his estate.