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In many episodes, Conan sees a tree branch or a rope and after a quick look, he states that it is recently cut which means it is done by the culprit.

How does he know that?

Aki Tanaka
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Ahmed Rajab
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    Not sure for the rope part. But a tree(branch) can be identified by it's humidity, color, and decay. Most of which can be seen on first glance – Dimitri mx Oct 13 '17 at 12:45

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A cut rope or branch (or any piece of wood) will start to discolor almost immediately. If you know what a fresh cut and non-recent cut look like it is not difficult to spot anything in between.

golux
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