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Cyanide works by making the human body unable to use oxygen.

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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.

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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

Death's-head Hawkmoth (Acherontia lachesis), an old bleached specimen still showing the classic Death's-head Hawkmoth (Acherontia lachesis), an old bleached specimen still showing the classic
Volvulus. A volvulus results when the small intestine twists, causing an obstruction that can lead t Volvulus. A volvulus results when the small intestine twists, causing an obstruction that can lead t
The Black Death spread over much of Europe in a three-year period in the middle of the fourteenth ce The Black Death spread over much of Europe in a three-year period in the middle of the fourteenth ce
Ten Leading Causes of Death in the United States, 2010. Ten Leading Causes of Death in the United States, 2010.
Downward Spiral of Poverty and Hunger Lack of food can lead to numerous other symptoms Downward Spiral of Poverty and Hunger Lack of food can lead to numerous other symptoms
Lead Displaces Iron Lead Displaces Iron
Video: baroreceptors

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