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  2. Open textbook - Wikipedia

    en.wikipedia.org/wiki/Open_textbook

    An open textbook is a textbook licensed under an open license, and made available online to be freely used by students, teachers and members of the public.Many open textbooks are distributed in either print, e-book, or audio formats that may be downloaded or purchased at little or no cost.

  3. Elevation Science Institute - Wikipedia

    en.wikipedia.org/wiki/Elevation_Science_Institute

    Among Elevation Science excavation sites is the Mother's Day Quarry which the team has been excavating since the summer of 2017. Elevation Science has excavated a wide variety of dinosaur genera including Diplodocus, Tyrannosaurus, Allosaurus, Triceratops, Leptoceratops, Suuwassea, Edmontosaurus, Ankylosaur, and many others. Their finds have ...

  4. Grading systems by country - Wikipedia

    en.wikipedia.org/wiki/Grading_systems_by_country

    In primary education, fractions of grades are identified with a + or −, which signifies a quarter (converted to either 0.8 or 0.3 if only one decimal place is used). Thus, a grade of 6.75 (or 6.8) could be written as 7−, whereas a grade of 7+ would count for 7.25 or 7.3. A 5.5 constitutes a pass, whereas 5.4 and below constitute a fail.

  5. This misconception, sometimes called the equal transit-time fallacy, is widespread among textbooks and non-technical reference books, and even appears in pilot training materials. In fact, the air moving over the top of an aerofoil generating lift is always moving much faster than the equal transit theory would imply, [ 441 ] as described in ...

  6. Grade (climbing) - Wikipedia

    en.wikipedia.org/wiki/Grade_(climbing)

    Adam Ondra on the sport climbing route Silence, the hardest free climbing route in the world and the first-ever at 9c (French), 5.15d (American YDS), and XII+ (UIAA).. The two main free climbing grading systems (which include the two main free climbing disciplines of sport climbing and traditional climbing) are the "French numerical system" and the "American YDS system". [2]

  7. Legislative history of United States four-star officers, 1980 ...

    en.wikipedia.org/wiki/Legislative_history_of...

    DOPMA standardized four-star appointments across all services, replacing the previous service-specific mechanisms. Under the Officer Personnel Act, four-star officers held that grade ex officio while serving in a position of importance and responsibility designated to carry that grade, and upon vacating that position reverted to two-star major general or rear admiral, the highest permanent ...

  8. Food loss and waste - Wikipedia

    en.wikipedia.org/wiki/Food_loss_and_waste

    [50]: 1, 7–8 In storage, considerable quantitative losses can be attributed to pests and micro-organisms. [ 51 ] [ 52 ] This is a particular problem for countries that experience a combination of heat (around 30 °C) and ambient humidity (between 70 and 90 per cent), as such conditions encourage the reproduction of insect pests and micro ...

  9. Index of branches of science - Wikipedia

    en.wikipedia.org/wiki/Index_of_branches_of_science

    When there is more than one article with information on a topic, the most relevant is usually listed, and it may be cross-linked to further information from the linked page or section. Science (from Latin scientia, meaning "knowledge") is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and ...

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