The fact that there are 20 human body neighbor we need to know are: 1. Each one hour trillion cells in the body must be replaced. 2. The human eye can distinguish 500 shades of gray. 3. Human thigh bones are stronger than concrete. 4. The human heart can create enough pressure to squirt blood 30 feet (9 m). 5. Our eyes are always the same size from birth, but our nose and ears never stop growing. 6. The average cough comes out of our mouths speed of 60 miles (96.5 km) per hour. 7. A beard is the hair that grows most rapidly in humans. If the average man never cut his beard, then this will make it grow to nearly 30 feet in life. 8. Baby's eyes do not produce tears until the baby was about six or eight weeks. 9. Each person has a different tongue shapes. 10. Sneeze can exceed the speed of 100 m / hour. 11. Dead cells in our body eventually carried to the kidneys for excretion....
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