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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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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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Triumphal Entry, page from a manuscript of Firdawsi's Shahnamah, Persian, Safavid culture. Triumphal Entry, page from a manuscript of Firdawsi's Shahnamah, Persian, Safavid culture.
Page from a copy of Nizami's Khamseh (Quintet) illustrating a princely country feast, Persian, ... Page from a copy of Nizami's Khamseh (Quintet) illustrating a princely country feast, Persian, ...
Marjane Satrapi, page from the "Kim Wilde" chapter of the graphic novel Persepolis. Marjane Satrapi, page from the "Kim Wilde" chapter of the graphic novel Persepolis.
William Morris, Page from a specimen book with sample proof letters, Kelmscott Press. William Morris, Page from a specimen book with sample proof letters, Kelmscott Press.
One page of color vision chart. One page of color vision chart.
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