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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.