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What molecular process drives this hardening and sets its rate is unknown.","posed_since":"","precise":"For FUS and hnRNPA1 condensates in vitro, viscosity and elastic modulus increase over hours (aging of a Maxwell fluid). Determine whether aging is driven by $\\beta$-sheet formation and fibril nucleation inside the dense phase, by glass-like slowing of sticker exchange, or by both, and predict the aging time as a function of sequence and temperature.","problem_ref":null,"references":"","settled_by":"Time-resolved rheology combined with structural probes of beta-sheet content on sequence variants, matched by a model that predicts aging times.","status_note":"","title":"Mechanism of liquid-to-solid aging of 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