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It depends strongly on temperature as well as the medium through which a sound wave is propagating. At 0 °C (32 °F), the speed of sound in air is about 331 m/s (1,086 ft/s; 1,192 km/h; 740 mph; 643 kn). [1] The speed of sound in an ideal gas depends only on its temperature and composition. The speed has a weak dependence on frequency and ...
ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes.
The Xerox Alto was one of the first computers designed for individual use in 1973 and is regarded as the first modern computer to use a mouse. [49] Alan Kay designed the 16-by-16 mouse cursor icon with its left edge vertical and right edge 45-degrees so it displays well on the bitmap. [ 50 ]
In September 2012, HP announced Spectre One, an all in one desktop computer shipping with Windows 8. It has a 23.6 inch display, measures 11.5 mm thick, and covered by edge to edge glass. It has a 23.6 inch display, measures 11.5 mm thick, and covered by edge to edge glass.
DNA ligase is a type of enzyme that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond.It plays a role in repairing single-strand breaks in duplex DNA in living organisms, but some forms (such as DNA ligase IV) may specifically repair double-strand breaks (i.e. a break in both complementary strands of DNA).
It was powered by a computer on a chip, and was compatible with most of the popular PCs of that time, including Apple II, II+ and IIe, BBC Micro, [10] Commodore 64, [11] IBM PC, NEC 8201, Tandy Color Computer, Model 1000, 1200, 2000 and TRS-80 Model I, III, 4 and 4p. The RC-20 Wrist Computer was released in 1985, [12] [13] followed by the RC ...
Winsome Sinclair, 58, American casting director (Belly, Cadillac Records, All Eyez on Me) and film producer, colon cancer. [149] Milan Špinka, 73, Czech speedway rider (Rudá Hvězda Praha, Ipswich Witches, Swindon Robins), ice speedway world champion (1974). [150] Heinrich Thun, 85, Austrian Olympic athlete (1960, 1964), heart attack. [151]
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