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In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
During peak daytime tourist hours, more than 168,000 m 3 (5.9 million cu ft) of water goes over the crest of the falls every minute. [3] Horseshoe Falls is the most powerful waterfall in North America, as measured by flow rate. [4] Niagara Falls is famed for its beauty and is a valuable source of hydroelectric power. Balancing recreational ...
Human height or stature is the distance from the bottom of the feet to the top of the head in a human body, standing erect. It is measured using a stadiometer, [ 1] in centimetres when using the metric system or SI system, [ 2][ 3] or feet and inches when using United States customary units or the imperial system. [ 4][ 5] In the early phase of ...
This is a list of the tallest people, verified by Guinness World Records or other reliable sources. According to the Guinness World Records, the tallest human in recorded history was Robert Wadlow of the United States (1918–1940), who was 272 cm (8 ft 11 in). He received media attention in 1939 when he was measured to be the tallest man in ...
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Although the division of hours into minutes and seconds did not occur until the Middle Ages, Classical astrologers had a minuta equal to 1 ⁄ 60 of a day (24 modern minutes), a secunda equal to 1 ⁄ 3600 of a day (24 modern seconds), and a tertia equal to 1 ⁄ 216,000 of a day (0.4 modern seconds).
The world's tallest grandfather clock is 35 feet 10 inches (10.92 m) tall and is fully operational, with chimes on each quarter hour. It was made by Svoboda Industries in 1976 as a Bicentennial project and is located in Kewaunee, Wisconsin. [4] [5] Clock-face signature of Tim Mason
Release. 7 November 2002. ( 2002-11-07) –. 18 March 2004. ( 2004-03-18) 15 Storeys High is a British sitcom, set in a tower block in south London. Created and co-written by Sean Lock, it originated as two radio series broadcast in 1998–2000, transferring to television in 2002–2004. The television series starred Sean Lock and Benedict Wong .