reatened by their enemies and Leonardo wanted to put in practice all his fantastic designs in benefit of the city. In a letter send to Francisco Sforza, Milan governor, Leonardo offered him his abilities to construct canons, catapults, war ships, digging tunnels under the enemy lines, grave drainages and methods for climbing castle brick walls. As well as for defending Milan Leonardo also wanted to make that city a pretty city such as Florence. It was the time in which he was living in that took him to invent all this fantastic devices to give the society problems a solution. Leonardo was always busy in making plan sketching for military inventions, such as; missiles, bombs, tanks and fortresses. He didn't had any opportunity to finish the mayor parts of his ideas, but he was a big precursor in his time period. The tank, for example wasn't use until the First World War, almost 450 years after Leonardo had designed his armored vehicle. When Leonardo died, he left more than 5000 pages of notes and drawings. He writed his notes in a kind of inverted letter or secret maybe because he was protecting from the church because in that time, the Renaissance was a period of full study, and the church still had a lot of power. Most of the things Leonardo writed were against the church. All this manuscripts reveal a man ahead of his time in every branch of science then known. He always tried to develop marvelous inventions to give the society technical progress and a more complete control over nature. All his interest in a wide range of scientific and technical problems, the exceptional quality of the sketches he drew to solve the society problems in that time. He achieved all this by constant ignorance about what scientists and engineers accomplish before and during his lifetime. This ignorance help leonardos bright intelligence think in things that were very sophisticated in that time, but if we take a closer look into this inventions and re...
