Even during the life of Leonardo da Vinci, there were legends. He was a mystery to his contemporaries and still remains one of the most mysterious figures in the history of mankind.“As a well-spent day brings a happy dream, so a fruitfully lived life gives satisfaction” - the great Italian remained true to this principle until the end of his days. He believed that both science and art are the way of knowing and transforming the world, and therefore he tried to understand the essence of all the things and phenomena around him - whether it be the structure of the human body, the flight of a bird, the origin of the rainbow or the theory of painting.The book publishes selected works of natural science by Leonardo da Vinci and his Treatise on Painting. The translation into Russian was made by the greatest scientists of the 20th century A. A. Guber and V. P. Zubov.