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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

Types of bariatric surgery; A, laparoscopic adjustable gastric banding; B, Roux-en-Y gastric bypass. Types of bariatric surgery; A, laparoscopic adjustable gastric banding; B, Roux-en-Y gastric bypass.
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