A detective or someone skilled at solving mysteries; often used ironically to address someone stating the obvious.
From Sherlock Holmes, the fictional detective created by Arthur Conan Doyle in 1887. The name became a common noun by the early 1900s, often used sarcastically.
Sherlock Holmes was partly inspired by Dr. Joseph Bell, Conan Doyle's medical school professor who could deduce patients' occupations and backgrounds from observation. The character's methods actually influenced real police detective work and forensic science.
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