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The average office desk has 400 times more bacteria on it than a toilet.

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

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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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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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

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