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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

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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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Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Countercurrent heat exchange. Countercurrent heat exchange.
Overview of gas exchange between the environment, blood, and cells. Overview of gas exchange between the environment, blood, and cells.
Countercurrent heat exchange in the lateral muscles of bluefin tuna. Countercurrent heat exchange in the lateral muscles of bluefin tuna.
Exchange of Oxygen and Carbon Dioxide Exchange of Oxygen and Carbon Dioxide
Flexible exchange rates are supposed to prevent long-term trade deficits. Flexible exchange rates are supposed to prevent long-term trade deficits.
The consequences of a single exchange between two nonsister chromatids The consequences of a single exchange between two nonsister chromatids
Video: Supine Position

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