Illicit drug use costs the United States approximately $181 billion every year.
Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
Race-Ethnicity and Income Extremes
Photo of a sign taken at an emissions test facility.
Action of type I and type II topoisomerases, as shown by gel electrophoresis
The Parade of World Income
Sign Language
Incomplete dominance shown in the flower color of snapdragons