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Did you know?

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 horizontal fraction bar was introduced by the Arabs.

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When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Video: Barriers - eye structures, digestive mucosa, respiratory mucosa & genitourinary mucosa

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