Piero Angela will tell us about a discovery he personally made of an authentic drawing by Leonardo in sanguine, never seen before. During the episode the presenter will try to understand who that man drawn with light eyes, long hair, a chin adorned with a light beard and a thoughtful look is, which is hidden between the words of the tenth page of his Flight Code of birds and will reconstruct the ways in which he came to see what no one else before him had seen.