· The heart is the strongest muscle in the body. · The largest muscle in your body is located in your rear end. · The human neck has the same number of vertebrae as a giraffe’s neck. · There are 22 bones in the human skull. · The human skull is 80% water. · The average human head weighs about 8 pounds. · Your heart is just a bit bigger than your fist. · The heart pumps 36,000 gallons of blood a day. · The smallest bone in the body is in your ear. · The femur (thigh bone) is the biggest bone in the body. ...