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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".
Schoology was designed by Jeremy Friedman, Ryan Hwang, and Tim Trinidad in 2007 while studying at Washington University in St. Louis. [1] Originally designed for sharing notes, features were gradually added and modified. Schoology secured its first round of equity financing, totaling $1,250,000, with an investment of unknown origin in 2009 and ...
The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. [1] A slate pencil was used to write on the slate board. It was made from a softer and lighter coloured stone such as shale or chalk. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes ...
Saccular acoustic sensitivity is a measurement of the ear 's affectability to sound. The saccule 's normal function is to keep the body balanced, but it is believed to have some hearing function for special frequencies and tones. Saccular acoustic sensitivity is considered to be simply an extension of the sense of hearing through the use of the ...
Blackboard chalk manufacturers now may use mineral chalk, other mineral sources of calcium carbonate, or the mineral gypsum (calcium sulfate). While gypsum-based blackboard chalk is the lowest cost to produce, and thus widely used in the developing world , use of carbonate-based chalk produces larger particles and thus less dust, and it is ...
Michael Chasen is an American businessman. He is a co-founder and former CEO of Blackboard Inc., a position he held from 1999 to 2012. In April 2013, Chasen co-founded SocialRadar, a technology startup company developing a location-based social app. In 2020, he co-founded ClassEDU, the maker of Class For Zoom, which aims to improve the ...
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