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Ledger Drawing, circa 1875–78, attributed to Bear’s Heart (1851–82), exhibited at the Frieze New York Art Fair. Photo: John Bigelow Taylor/Courtesy of Donald Ellis Gallery, New York A great ...

This is his drawing of the female anatomy, including the heart and major organs When Leonardo da Vinci dissected the heart of a 100-year-old man who had recently died, he produced the first known ...