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Katherine Johnson ( née Coleman; August 26, 1918 – February 24, 2020) was an American mathematician whose calculations of orbital mechanics as a NASA employee were critical to the success of the first and subsequent U.S. crewed spaceflights.

The National Aeronautics and Space Administration(NASA/ˈnæsə/) is an independent agencyof the U.S. federal governmentresponsible for the civilian space program, as well as aeronauticsand spaceresearch. [note 1] NASA was established in 1958, succeeding the National Advisory Committee for Aeronautics(NACA).

Sign languages(also known as signed languages) are languagesthat use the visual-manual modality to convey meaning. Sign languages are expressed through manual articulations in combination with non-manual elements. Sign languages are full-fledged natural languages with their own grammar and lexicon.[1]

Derrick Jensen. Loren Mosher. Ronald David Laing (7 October 1927 – 23 August 1989), usually cited as R. D. Laing, was a Scottish psychiatrist who wrote extensively on mental illness – in particular, the experience of psychosis. Laing's views on the causes and treatment of psychopathological phenomena were influenced by his study of ...

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.