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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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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.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

blue-footed boobies blue-footed boobies
A purse made from a cane toad. A purse made from a cane toad.
In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con
Suzuki Harunobu, Two Courtesans, Inside and Outside the Display Window. Suzuki Harunobu, Two Courtesans, Inside and Outside the Display Window.
1.6 Organisms are made up of cells, each of which contains an identical set of genes. 1.6 Organisms are made up of cells, each of which contains an identical set of genes.
Video: Mitosis step-by-step

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