The surface area of a human lung is equal to a tennis court.
The aorta is nearly the diameter of a garden hose.
A full bladder is roughly the size of a soft ball.
During your lifetime, you will produce enough saliva to fill two swimming pools.
A fetus acquires fingerprints at the age of three months.
About 32 million bacteria call every inch of your skin home.
Every day an adult body produces 300 billion new cells.
Your body gives off enough heat in 30 minutes to bring half a gallon of water to a boil.
And 92 more here.