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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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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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There are more bacteria in your mouth than there are people in the world.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

Three bonds separate sequential α carbons in a polypeptide chain Three bonds separate sequential α carbons in a polypeptide chain
Regular Ways to Fold the Polypeptide Chain Regular Ways to Fold the Polypeptide Chain
The polypeptide II helix The polypeptide II helix
Carbohydrates: Sugars, Starches, and Fiber Carbohydrates: Sugars, Starches, and Fiber
Adding fiber to the diet Adding fiber to the diet
Structure of polypeptide chains Structure of polypeptide chains
Video: Types of Shock (Part 2 of 2)

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