There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The longest a person has survived after a heart transplant is 24 years.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Vaccines prevent between 2.5 and 4 million deaths every year.
TEN RULES OF PERFORMANCE IN A REDESIGNED HEALTH CARE SYSTEM
In the summer of 1793, a yellow fever epidemic struck Philadelphia, killing nearly 4,000. Tens of th
Mathematical Rules and Guidelines
Historical Time Line of Regulatory Acts, Standards, and Organizations