How to Weigh Truth With a Balance Scale

Balance-scale puzzles abound in recreational mathematics. The essential element is the humble two-pan balance scale — a staple of commerce over the millennia that’s still found in bustling rural bazaars in the developing world. The simplest versions consist of a metal beam from which hang two pans at equal distances from the central support or fulcrum. The double-pan balance scale is an iconic and…

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