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Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards , matching games , practice electronic assessments , and live quizzes.
An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...
The Right Stuff is a 1979 book by Tom Wolfe about the pilots engaged in U.S. postwar research with experimental rocket-powered, high-speed aircraft as well as documenting the stories of the first astronauts selected for the NASA's Project Mercury program.
A Royal Australian Air Force aircraftswoman demonstrating the use of an oxygen mask during a pre-flight safety demonstration on board an Australian Airbus A330 MRTT. A pre-flight safety briefing (also known as a pre-flight demonstration, in-flight safety briefing, in-flight safety demonstration, safety instructions, or simply the safety video) is a detailed explanation given before take-off to ...
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At 40,000 ft (12,192 m), the ambient air pressure falls to about 0.2 bar, at which maintaining a minimum partial pressure of oxygen of 0.2 bar requires breathing 100% oxygen using an oxygen mask. Emergency oxygen supply masks in the passenger compartment of airliners do not need to be pressure-demand masks because most flights stay below 40,000 ...
Reportedly achieved sustained unpowered flight for 3.36 km (2 mi) (c. 1638). [53] [nb 15] Lagari Hasan Çelebi: 17th century Turkey Design Construction Aviator Rocket: Reported to have achieved flight (20 seconds to an elevation of roughly 300 meters) using a winged rocket powered by gunpowder (c. 1630s). [53] Henri Coandă: 7 Jun 1886 25 Nov ...
Rival planes include the Martin 2-0-2 and Martin 4-0-4, but the 2-0-2 had safety concerns and was unpressurized, while the 4-0-4 only sold around 100 units. [ 63 ] During the postwar years, engines became much larger and more powerful, and safety features such as deicing, navigation, and weather information were added to the planes.