Late one night: "Why are you crawling around under the street light?" "Lost my keys." "Here, on the corner?" "No, back there 'bout half a block." "So why are you looking here?" "The light is better here." Lamppost reasoning / "drunkard's search" -- maybe it means (re)searching where it's easier, or more convenient, or funding is available, or it's the only background info you know, or the light is better... rather than where the answer lies. Reference: the cartoon in another version of what I think is the one you (Mr Red) linked to. https://indico.nikhef.nl/event/1815/contribution/1/material/slides/0.pdf (That cartoon looks a lot like the style of mudcatter jfweldon. Jus'sayin')
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