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  2. Knowledge - Wikipedia

    en.wikipedia.org/wiki/Knowledge

    Knowledge is the primary subject of the field of epistemology, which studies what we know, how we come to know it, and what it means to know something. Defining knowledge is an important aspect of epistemology, because it does not suffice to have a belief; one must also have good reasons for that belief, because otherwise there would be no reason to prefer one belief over another.

  3. Applications of 3D printing - Wikipedia

    en.wikipedia.org/wiki/Applications_of_3D_printing

    One of the most promising processes looks to be the adaptation of selective laser sintering (SLS), or direct metal laser sintering (DMLS) some of the better-established rapid prototyping methods. As of 2006 [update] , however, these techniques were still very much in their infancy, with many obstacles to be overcome before RM could be ...

  4. Factor analysis - Wikipedia

    en.wikipedia.org/wiki/Factor_analysis

    Confirmatory factor analysis (CFA) is a more complex approach that tests the hypothesis that the items are associated with specific factors. CFA uses structural equation modeling to test a measurement model whereby loading on the factors allows for evaluation of relationships between observed variables and unobserved variables.

  5. Columbia University - Wikipedia

    en.wikipedia.org/wiki/Columbia_University

    It is the oldest gay student organization in the world, founded as the Student Homophile League in 1967 by students including lifelong activist Stephen Donaldson. [248] [249] Columbia University campus military groups include the U.S. Military Veterans of Columbia University and Advocates for Columbia ROTC.

  6. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_Page

    Etta Lemon (1860–1953) was a British bird conservationist and a founder of what is now the Royal Society for the Protection of Birds (RSPB). Born into an evangelical family in Kent, she became a campaigner against the use of plumage in hatmaking.