‘blouson noir’: meaning and origin

in French contexts: a young person, especially a young man, belonging to a youth subculture of the 1950s and 1960s—UK, 1959—from the noun ‘blouson’ (a short jacket) and the adjective ‘noir’ (black)

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‘Dunning-Kruger effect’: meaning and origin

a bias whereby people who have little ability in, or knowledge of, a particular task or subject tend to overestimate their capabilities—USA, 2008—refers to David Dunning and Justin Kruger, who described this bias in the Journal of Personality and Social Psychology in 1999

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