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36. There are no muscles in your fingers: Their function is controlled by muscles in your palms and arms. (assh.org)
37. The hardest working muscle in your body is your heart: It pumps more than 2,000 gallons of blood a day and beats more than 2.5 billion times in a 70-year life span. (heart.org)
38. It’s impossible to hum while holding your nose (just try it!).
39. Skin is the body’s largest organ.
40. The earth’s circumference is 24,900 miles. (nasa.gov)