"The short snake can escape down A, but the long one can't. The long snake can escape down B, but the short one can't."
"The passages must have no moving parts, trapdoors or levers. The snakes can wiggle but they can't squeeze through passages that are narrower than they are wide."
Two snakes of equal width are in a cage, one long and one short. Two escape passages, A and B, are designed such that the short snake can escape down passage A, while the long snake cannot. Conversely, the long snake can escape down passage B, but the short snake cannot. The passages must be designed without moving parts, trapdoors, or levers, and the snakes cannot squeeze through narrower passages than their width.
Read at www.theguardian.com
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