WTF Fun Fact – Da Vinci’s Oxen Heart Valve

Leonardo Da Vinci once created a replica of a heart valve by pouring hot wax into an oxen’s heart, making a mold of thin glass from the cast, and then pumping water mixed with seeds through it. He identified vortices which help close the heart valve after each beat. WTF Fun Facts

Source: https://www.rct.uk/collection/919082/the-aortic-valve

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