... observed and used a variety of machines; by studying them he gained practical knowledge about their design and structure. He realized that by understanding how each separate machine part worked, he could change them and combine them in different ways to improve existing machines or create inventions no one had ever seen before, this method worked but, only 500 years after did they get published. He soon started inventing flying objects such as helicopters and gliders, by observing birds, bats and other flying creatures, those inventions which are used today. These inventions were made when technology was still at a low level and had barely advanced. Leonardo was so smart that he invented his own way of writing, mirror writing (this is his name) no one knows why he did this: This is how he normally wrote, when he wanted no one else to read it except for himself. This is how ...

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