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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.