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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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Everyone has one nostril that is larger than the other.

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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

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