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Leonardo da Vinci’s greatest discovery in all of his anatomical works was his discovery of the way the aortic valve works, a triumph that was confirmed only in modern times. The painter often switched focus during a project which led to unfinished or unfinished work. For example, Pope Leo X commissioned a picture from the painter by experimenting with formulas for the varnish to coat the painting. After twelve years of construction, the statue was halted as the construction of seventy tonnes of bronze were halted as seventy tonnes were supposed.