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There are 60,000 miles of blood vessels in every adult human.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.