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Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
NASA (historical) Number built. 32. Developed from. Lockheed A-12. The Lockheed SR-71 " Blackbird " is a retired long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft developed and manufactured by the American aerospace company Lockheed Corporation. [N 1] The SR-71 has several nicknames, including "Blackbird" and "Habu".
It was formed approximately 4.5 billion years ago, is a terrestrial planet and is the second smallest of the Solar System 's planets with a diameter of 6,779 km (4,212 mi). A Martian solar day ( sol) is 24.5 hours and a Martian solar year is 1.88 Earth years (687 Earth days). Mars has two small and irregular natural satellites: Phobos and Deimos.
Fibonacci sequence. A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn .
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A blackboard is a reusable writing surface. Look up blackboard in Wiktionary, the free dictionary. Blackboard may also refer to: Black board (Soviet policy), sign used in the Soviet era publicly to chastise farms or factories for such things as failing to meet targets or opposing collectivisation. Blackboard bold, a style of typeface often used ...
The PMI Group is a holding company whose primary subsidiary is the PMI Mortgage Insurance Co. (PMI). The company was founded in 1972 by Preston Martin and is headquartered in Walnut Creek, California . PMI has a 50% equity ownership in CMG Mortgage Insurance Company, founded in 1994 as a JV with C UNA M utual G roup, and CMG Mortgage Assurance ...
Blackboard Jungle is an Irish quiz show hosted by Ray D'Arcy that aired for seven series on Network 2 between 1991 and 1998. The show, which aired up to three times a week, featured two teams of three representing two competing secondary schools. A grand final was held at the end of each series. [1]