The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
The nurse is using Standard Precautions to draw blood.
Using a sphygmomanometer to measure blood pressure.
Primary factors affecting blood pressure
Particles measured, 1970 - 2008 and Trend in Organic Compound 1990 - 2007
Warfarin An anticoagulant drug given to prevent blood from clotting