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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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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.
[6] David Mumford introduces Mumford–Tate groups. [7] Euler's sum of powers conjecture is disproven by L. J. Lander and T. R. Parkin when, through a direct computer search on a CDC 6600, they have found the counterexample 27 5 + 84 5 + 110 5 + 133 5 = 144 5. Their paper [8] announcing the result is one of the shortest published scientific ...
The IBM System/360 (S/360) is a family of mainframe computer systems announced by IBM on April 7, 1964, [1] and delivered between 1965 and 1978. [2] System/360 was the first family of computers designed to cover both commercial and scientific applications and a complete range of applications from small to large.
LSD is made illegal in the United States and controlled so strictly that not only are possession and recreational use criminalized, but all legal scientific research programs on the drug in the country are shut down as well.
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.
[3]: 216 [5]: 92 [30] However Maiman identified multiple flaws in the Schawlow-Townes proposal and the reason for their rejection of a solid-state design, including a significant difference in the band-gap nature of pink rubies and red rubies, and pursued his own vision: [5]: 111 [14]: 159–164 [31] [15] "I was the only one that analyzed ruby ...