The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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There are more sensory neurons in the tongue than in any other part of the body.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Attack systems of pathogenic bacteria.
Sickle cell anemia. The clinical manifestations of sickle cell anemia result from pathologic changes
Systems of humans
Artesian Systems
Political and Economic Systems
Comparison of open and closed circulatory systems.