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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Effect of stimulus type on graded potentials. Effect of stimulus type on graded potentials.
Gerotor-type oil pump driven by the crankshaft. Gerotor-type oil pump driven by the crankshaft.
Voltmeter hookup to test the voltage drop of the charging circuit. Voltmeter hookup to test the voltage drop of the charging circuit.
(a) As an engine is accelerated under a load, the engine vacuum drops. This drop in vacuum is ... (a) As an engine is accelerated under a load, the engine vacuum drops. This drop in vacuum is ...
Proposed structure for keratin-type intermediate filaments Proposed structure for keratin-type intermediate filaments
The Type of Blood Vessel Injury Often Affects the Nature of the Hemorrhage The Type of Blood Vessel Injury Often Affects the Nature of the Hemorrhage
Video: Photosynthesis overview Animation

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