- The average human produces 25,000 quarts of saliva in a life time, enough to fill two swimming pools.
- A human skeleton renews itself completely every 10 years.
- Bone is five times stronger than steel bar of the same width, but it is brittle and can fracture on impact.
- The brain contains 86 billion nerve cells joined by 100 trillion connections. This is more than the number of stars in the Milky Way.
- Like fingerprints, each human tongue has its own unique print.
- There are about 9,000 taste buds on the surface of the tongue, in the throat, and on the roof of the mouth.
- Messages from the human brain travel along nerves at up to 200 miles an hour (322 km/h).
- A human’s nose and ears never stop growing.
- In an adult human, 25% of their bones are in the feet.
- A human’s little finger contributes over 50% of the hand’s strength.