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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Body cavities. (A) Lateral view of a sagittal section through the body. (B) Anterior view of a front Body cavities. (A) Lateral view of a sagittal section through the body. (B) Anterior view of a front
Sagittal section of the nasal cavity and pharynx. Sagittal section of the nasal cavity and pharynx.
Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t
Pasteur separated crystals Pasteur separated crystals
Nasal and oral cavities Nasal and oral cavities
The major structures of the limbic system: amygdala, hippocampus, cingulate cortex, fornix, septum, ... The major structures of the limbic system: amygdala, hippocampus, cingulate cortex, fornix, septum, ...
Video: Chemical Buffers - protein buffer, phosphate buffer system and bicarbonate buffer system

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