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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Kohlberg's Stages of Moral Development Kohlberg's Stages of Moral Development
Growth in Cold and Cool Clouds Growth in Cold and Cool Clouds
Population growth in India, China, Africa, and other countries in the developing world Population growth in India, China, Africa, and other countries in the developing world
Secondary growth Secondary growth
Development of the Dungeness crab (Cancer magister). The crabs live for 8 to 10 years. Development of the Dungeness crab (Cancer magister). The crabs live for 8 to 10 years.
Growth of cultured cells from patients with xeroderma pigmentosum (XP) Growth of cultured cells from patients with xeroderma pigmentosum (XP)
Video: Red Blood Cells - Erythropoietin (EPO)

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