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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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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Cooked tarantula spiders are considered a delicacy in Cambodia. Cooked tarantula spiders are considered a delicacy in Cambodia.
An 1891 cartoon blames immigrants for the ills of American society: anarchy, socialism, mayhem, and An 1891 cartoon blames immigrants for the ills of American society: anarchy, socialism, mayhem, and
René Descartes (1596–1650). French philosopher considered the founder of modern philosophy. A ... René Descartes (1596–1650). French philosopher considered the founder of modern philosophy. A ...
Immanuel Kant (1724–1804). German philosopher considered by many to be the greatest thinker of the ... Immanuel Kant (1724–1804). German philosopher considered by many to be the greatest thinker of the ...
Every society has boundaries that divide what is considered socially acceptable from what is not ... Every society has boundaries that divide what is considered socially acceptable from what is not ...
Aging is more than biology. In some cultures, Jennifer Lopez, 43, would be considered elderly. Lopez ... Aging is more than biology. In some cultures, Jennifer Lopez, 43, would be considered elderly. Lopez ...
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