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Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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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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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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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Blood is approximately twice as thick as water because of the cells and other components found in it.