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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.
![Human photopic (cone) and scotopic (rod) spectral sensitivity curves. The peak of each curve has ...](https://biology-forums.com/gallery/30/medium_548020_05_06_17_11_21_54_302931683.png)
![Effect-log dose curve for the analgesic action of three narcotics and aspirin. Hydromorphone is more ...](https://biology-forums.com/gallery/31/medium_398119_17_07_17_10_01_42_319541561.jpeg)