QED Night
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Control

Unreviewed import — a classic from the public domain; its solution has not been machine-checked yet.

riddle
This is something that appears important in exhibitions and can be cheap, often disregarded. But humanity struggles to control it, and with minimal effort, people interact with it daily. What is this?

Solution

Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.

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