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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Relatively simple changes in Hox genes control limb formation in tetrapods. Relatively simple changes in Hox genes control limb formation in tetrapods.
Gate Control Theory, Gate control, Open gate, Closed gate, Pain, Nerve transmission of pain, Pain ma Gate Control Theory, Gate control, Open gate, Closed gate, Pain, Nerve transmission of pain, Pain ma
Control of Secretion of Stress Hormones Control of Secretion of Stress Hormones
This slave burial service, painted by John Antrobus in 1860, reflects an inversion of power relation This slave burial service, painted by John Antrobus in 1860, reflects an inversion of power relation
Electrostatic interactions between macroions Electrostatic interactions between macroions
Control you knife with one hand and hold the item being cut with the other (3 of 3) Control you knife with one hand and hold the item being cut with the other (3 of 3)
Video: Photosynthesis and Van Helmont Experiment

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