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Author Question: 10. The resonant frequency of a cavity may be varied by changing any of three parameters: cavity ... (Read 12 times) |
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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.
The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.