Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Mechanisms of water movement from soil through plants to the atmosphere.
St. John's Water Dog (Extinct)
Your Body Is Mostly Water
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Hydrozoan. Hydra, a freshwater species capturing and digesting a water flea.