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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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There are approximately 3 million unintended pregnancies in the United States each year.

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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Video: Major Elements in Biological Molecules: Nucleic acids

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