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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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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
The American Sign Language Alphabet.
PMDD Diagnostic Criteria from the American Psychiatric Association
Portrait of Typical 12-year-old Boy and Girl, 1981 and 2007-2009
How to calculate the gain and loss gene numbers with low bootstrap of phylogenetic tree?