Counting down the human body -- There are 100 trillion good bacteria living on the human body -- There are one trillion, 300 billion skin cells on the human body -- Blondes have 146 thousand strands of hair on their heads -- The heart beats one hundred thousand times a day -- Blood travels sixty thousand miles (96,560 km) a day -- We take 20 thousand breaths a day -- More than six hundred muscles in your body -- 206 bones in the human body -- 12-72 hours to digest food -- Nine months for a baby to grow inside the womb -- Five senses -- The human brain weighs 3 pounds.