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References
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Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar
Ten Days That Vanished: The Switch to the Gregorian Calendar
Drinking water is poured into a glass.
Water Fluoridation: Just the Facts
Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg
Spies Like Us: 10 Famous Names in the Espionage Game
Internet http://www blue screen. Hompepage blog 2009, history and society, media news television, crowd opinion protest, In the News 2009, breaking news
Who Invented the Internet?
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant
7 of the World’s Deadliest Plants
Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.
7 Deadliest Weapons in History

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ancient unit of length
Also known as: inch, pollicus

Learn about this topic in these articles:

Roman measurement system

  • How are SI-derived units of measurement calculated?
    In measurement system: Greeks and Romans

    73 inch); the inch (uncia or pollicus), or 1/12 Roman foot, was 24.67 mm (0.97 inch); and the palm (palmus), or 1/4 Roman foot, was 74 mm (2.91 inches).

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