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In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet, although it is commonly used to mean "perfect vision" in countries using the Imperial system.
Wikipedia @ 20 is a book of essays about Wikipedia published by the MIT Press in late 2020, marking 20 years since the creation of Wikipedia.It was edited by academic and author Joseph M. Reagle Jr. and social researcher Jackie Koerner.
Ann Arbor is a city in and the county seat of Washtenaw County in the U.S. state of Michigan.Founded in 1824 by John Allen and Elisha Rumsey, it was named after the wives of the village's founders, both named Ann, and the stands of bur oak trees they found there.
A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...
The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
Official $20 bill prototype featuring Harriet Tubman. In a campaign called "Women on 20s", selected voters were asked to choose three of 15 female candidates to have a portrait on the $20 bill. The goal was to have a woman on the $20 bill by 2020, the centennial of the 19th Amendment which gave women the right to vote. [13]
The key feature is that each team bats for a maximum of 20 overs (120 legal balls). The batting team members do not arrive from and depart to traditional dressing rooms, but come and go from a bench (typically a row of chairs) visible in the playing arena, analogous to association football's technical area or a baseball dugout .
Twenty or 20 may refer to: 20 (number), the natural number following 19 and preceding 21; one of the years 20 BC, AD 20, 1920, 2020; Science.