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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

Timing of teratogens. Vulnerability to teratogens is greatest in the embryonic period. Source: Moore Timing of teratogens. Vulnerability to teratogens is greatest in the embryonic period. Source: Moore
A mound of buffalo skulls. In 1870 an estimated 30 million buffalo roamed the plains; by 1900 there A mound of buffalo skulls. In 1870 an estimated 30 million buffalo roamed the plains; by 1900 there
Distribution of the Income of Americans Distribution of the Income of Americans
Cover heat source to slow cooling by placing a towel over it. Cover heat source to slow cooling by placing a towel over it.
Potatoes are a good source of complex carbohydrates Potatoes are a good source of complex carbohydrates
Gene expression consists of transcription of DNA into mRNA Gene expression consists of transcription of DNA into mRNA
Video: Krebs cycle : Formation of acetyl coenzyme A and Electron transport chain

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