The mouth has 32 teeth.
A fingernail or toenail takes about 6 months to grow from base to tip.
A human being loses an average of 40 to 100 strands of hair a day.
An individual blood cell takes about 60 seconds to make a complete circuit of the body.
Babies are born with 300 bones, but by adulthood we have only 206 in our bodies.
Every person has a unique tongue print.
Every square inch of the human body has an average of 32 million bacteria on it.
Fingerprints serve a function - they provide traction for the fingers to grasp things.
Humans shed about 600,000 particles of skin every hour
- about 1.5 pounds a year.
The air that leaves a person's lungs during exhalation contains 14% oxygen and 4.4% carbon dioxide. Atmospheres with oxygen concentrations below 19.5 percent can have adverse physiological effects, and atmospheres with less than 16 percent oxygen can become life threatening.