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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Procedures and Diagnostic Tests Related to the Urinary System Procedures and Diagnostic Tests Related to the Urinary System
Wintrobe tube and Westergren tests are used to measure the ESR. Wintrobe tube and Westergren tests are used to measure the ESR.
Positive and negative selection during T-cell development. Positive and negative selection during T-cell development.
Early stages of embryonic development in Drosophila Early stages of embryonic development in Drosophila
Development of a Frog Development of a Frog
Embryonic development of shepherd’s purse (Capsella), a eudicot Embryonic development of shepherd’s purse (Capsella), a eudicot
Video: Membrane Protein and Facilitated Transport (Passive Vs Active)

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