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Did you know?
According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.