Biology Facts & Trivia - Page 993% of a water melon is water. The human body has less muscles in it than a caterpillar. Sciensational.com When you blush, your stomach lining also reddens. The human body contains about six-thousand miles of blood vessels. Sciensational.com The surface area of a human lung is equal to that of a tennis court. From the age of thirty, humans gradually begin to shrink in size. Sciensational.com The housefly hums in the middle octave, key of F |