10 interesting facts about human body

 1. Bones are four times stronger than concrete

 2. Human body produces enough saliva in a life time to fill two swimming pools

 3. The acid in the stomach is strong enough to dissolve zinc

 4. The nose can recognize and remember 50,000 scents

 5. In 30 min the human body gives off enough heat to heat a gallon of water

 6. There are 45 miles of nerves in the human body

 7. The human body have enough carbon to fill 1,000 pencils

 8. Our heart pumps 2,000 gallons of blood each day

 9. Human sneeze at a speed of up to 100 mph

 10. Nerve impulse  travel as fast as 170 mph

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