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  • Red blood cells are produced in bone marrow.

  • A person produces enough saliva to fill 2 average size swimming pools during their lifetime.

  • The Great Wall of China is approximately 6,430 Km long (3,995 miles).

  • A woodpecker can peck 20 times a second.

  • The number 4 is the only number that has the same number of letters in it.

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