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Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.