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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.
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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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There are more sensory neurons in the tongue than in any other part of the body.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.