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A stopwatch is a timepiece designed to measure the amount of time that elapses between its activation and deactivation. A large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a stop clock. In manual timing, the clock is started and stopped by a person pressing a button.
Samuel Watson (fl. c.1635-c.1710), [1] was a horologist (clock and watch maker) who invented the 5 minute repeater, [2] and made the first stopwatch. [1] He made a clock for King Charles II [ 3 ] and was an associate of Isaac Newton .
High-intensity interval training. High-intensity interval training (HIIT) is a training protocol alternating short periods of intense or explosive anaerobic exercise with brief recovery periods until the point of exhaustion. [1] HIIT involves exercises performed in repeated quick bursts at maximum or near maximal effort with periods of rest or ...
The 12th-century Jayrun Water Clock at the Umayyad Mosque in Damascus was constructed by Muhammad al-Sa'ati, and was later described by his son Ridwan ibn al-Sa'ati in his On the Construction of Clocks and their Use (1203). [45] A sophisticated water-powered astronomical clock was described by Al-Jazari in his treatise on machines, written in ...
Complication (horology) In horology, a complication is any feature of a timepiece beyond the display of hours, minutes and seconds. A timepiece indicating only hours, minutes and seconds is known as a simple movement. Common complications include date or day-of-the-week indicators, alarms, chronographs (stopwatches), and automatic winding ...
Shape of You" became the second video to reach four billion views in January 2019, [27] followed by "See You Again" in February 2019. [25] ". Baby Shark Dance" became the second video to reach five billion views in April 2020, [62] followed by "Shape of You" in October 2020.
4′33″[a] is a modernist composition [b] by American experimental composer John Cage. It was composed in 1952 for any instrument or combination of instruments; the score instructs performers not to play their instruments throughout the three movements. It is divided into three movements, [c] lasting 30 seconds, two minutes and 23 seconds ...
YouTube is an American online video-sharing platform headquartered in San Bruno, California, founded by three former PayPal employees— Chad Hurley, Steve Chen, and Jawed Karim —in February 2005. Google bought the site in November 2006 for US$1.65 billion, since which it operates as one of Google's subsidiaries.