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Quizlet made its first acquisition in March 2021, with the purchase of Slader, which offered detailed explanations of textbook concepts and practice problems, and eventually incorporated it into its paid platform, Quizlet Plus. [20] [21] [22] In November 2022, Quizlet announced a new CEO, Lex Bayer, the former CEO of Starship Technologies. [23]
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Surveyor 6 effects of the vernier-rocket engine blast on the double imprint previously made in the lunar surface by one of the spacecraft's crushable blocks during the initial touchdown Surveyor 6 was the first spacecraft planned to lift off from the Moon's surface.
Project Gemini (IPA: / ˈ dʒ ɛ m ɪ n i /) was the second United States human spaceflight program to fly. Conducted after the first American crewed space program, Project Mercury, while the Apollo program was still in early development, Gemini was conceived in 1961 and concluded in 1966.
October 1 – West Coast Airlines Flight 956 crashes with 18 fatal injuries and no survivors 5.5 miles (8.9 km) south of Wemme, Oregon. This accident marks the first loss of a DC-9. [10] October 5 – An experimental breeder reactor at the Enrico Fermi Nuclear Generating Station in Michigan suffers a partial meltdown when its cooling system fails.
The reason for the development of the Chitling Test was to show that blacks and whites are fundamentally opposed in their manner of speech. [1] Some believe that many modern day tests are racially unfair and play to the advantage of the middle class, white population.
The history of computing hardware starting at 1960 is marked by the conversion from vacuum tube to solid-state devices such as transistors and then integrated circuit (IC) chips. Around 1953 to 1959, discrete transistors started being considered sufficiently reliable and economical that they made further vacuum tube computers uncompetitive .