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The list is only partly reproducible and no material property is known that predicts it.","posed_since":"1757","precise":"Find a measurable material property (effective work function, acid-base surface chemistry, water affinity, Lewis basicity, elastic or fracture properties) that predicts sign and magnitude of contact charge for arbitrary insulator pairs, and determine whether the series is transitive under clean controlled contact or contains cyclic violations. An answer is a predictor with quantified success rate on a benchmark of pairs plus a transitivity test.","problem_ref":null,"references":"","settled_by":"Controlled-atmosphere pairwise charging of a large set of materials, with transitivity tested and a single property predicting the order.","status_note":"","title":"Physical origin of the triboelectric 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