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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Anthropologist Andrea Wiley (left) investigates the effects of high-altitude living on reproductive Anthropologist Andrea Wiley (left) investigates the effects of high-altitude living on reproductive
Cross-sectional data showing that the amount of effort spent on personal health care increases with Cross-sectional data showing that the amount of effort spent on personal health care increases with
The permissible exposure limit (PEL) and immediately dangerous to life and health (IDLH) ... The permissible exposure limit (PEL) and immediately dangerous to life and health (IDLH) ...
Vitamin D plays a major role in bone health Vitamin D plays a major role in bone health
Eating calcium-rich foods daily assists with bone health, muscle contraction, and blood clotting Eating calcium-rich foods daily assists with bone health, muscle contraction, and blood clotting
Access to clean drinking water is just as important as adequate nutrition for human health Access to clean drinking water is just as important as adequate nutrition for human health
Video: Introduction to Epilepsy

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