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  2. Sabrina Cruz - Wikipedia

    en.wikipedia.org/wiki/Sabrina_Cruz

    As of November 2024, the channel has 1.6 million subscribers and 95.7 million views. She also hosted Crash Course Kids, the children-oriented version of the educational YouTube series Crash Course. [4] Originally from Toronto, Ontario, she graduated from Notre Dame Catholic Secondary School in Ajax. [5]

  3. Complexly - Wikipedia

    en.wikipedia.org/wiki/Complexly

    Multiple hosts and courses; see main article. Crash Course is an educational YouTube channel providing many courses of study, often based around the AP curriculum of a given subject. The level of study matches that of high school or early college, but the content is available for all ages. Many courses are co-produced with PBS Digital Studios.

  4. Crash Course (web series) - Wikipedia

    en.wikipedia.org/wiki/Crash_Course_(web_series)

    In addition, Economics was filmed at the YouTube Space in Los Angeles, while Crash Course Kids was filmed in a studio in Toronto, Ontario. Crash Course Kids was directed by Michael Aranda and produced by the Missoula Crash Course team. Once filmed, an episode goes through a preliminary edit before it is handed off to the channel's graphic ...

  5. Earth science - Wikipedia

    en.wikipedia.org/wiki/Earth_science

    In Earth science, it is common to conceptualize the Earth's surface as consisting of several distinct layers, often referred to as spheres: the lithosphere, the hydrosphere, the atmosphere, and the biosphere, this concept of spheres is a useful tool for understanding the Earth's surface and its various processes [30] these correspond to rocks ...

  6. Crash Course (game show) - Wikipedia

    en.wikipedia.org/wiki/Crash_Course_(game_show)

    Crash Course is an American game show that premiered on ABC on August 26, 2009. It is hosted by Orlando Jones and Dan Cortese . The series has teams of two competing for a golden steering wheel and $50,000.

  7. Crash Kids - Wikipedia

    en.wikipedia.org/wiki/Crash_Kids

    Crash Kids is a 1996 German television film drama directed by Petra Haffter and starring Isabell Gerschke and Marek Harloff. The film was first broadcast on television on December 13, 1996, on Arte .

  8. Spherical geometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_geometry

    Since spherical geometry violates the parallel postulate, there exists no such triangle on the surface of a sphere. The sum of the angles of a triangle on a sphere is 180°(1 + 4f), where f is the fraction of the sphere's surface that is enclosed by the triangle.

  9. Sphere packing - Wikipedia

    en.wikipedia.org/wiki/Sphere_packing

    Here there is a choice between separating the spheres into regions of close-packed equal spheres, or combining the multiple sizes of spheres into a compound or interstitial packing. When many sizes of spheres (or a distribution) are available, the problem quickly becomes intractable, but some studies of binary hard spheres (two sizes) are ...