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crevice

  1. Ron_Tomkins

    I need a method for detecting crevices

    I remember a scene in the latest Sherlock Holmes movie where Robert Downey Jr sits in a room, and puffs a bit of body powder. We then see a close up of a cloud of body powder which is then absorbed by a small crevice in a wall. In this way, Holmes detects a secret passage behind the wall. Now...
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