Amazing Human Body image fact
- The average human brain has about 100 billion nerve cells.
- Hair is made from the same substance as fingernails.
- There are 45 miles (72 km) of nerves in the skin of a human being.
- Every year about 98% of the atoms in your body are replaced.
- Each square inch (2.5 cm) of human skin consists of 20 feet (6 m) of blood vessels.
- Human blood travels 60,000 miles (96,540 km) per day on its journey through the body.
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