Miles of Blood Vessels

Drawing of the heart and its blood vessels from Leonardo da Vinci's anatomical notebooks; date unknown. Held by: Biblioteca Ambrosiana, Milan, Italy.

The average child has over 60,000 miles (10+04) of blood vessels in his or her body, according to The Franklin Institute.  Adults have even more—roughly 100,000 miles (10+05) of blood vessels.  Laid out end to end, they would circle the earth four times and the moon nearly fifteen.

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