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Multiple studies have demonstrated the unique power of red on human psychology. In sports, competitors wearing red win more often (a study of Olympic combat sports found a statistically significant advantage). Red backgrounds increase the speed and force of motor reactions. Red sale tags increase perceived value of discounts. In romantic contexts, red is consistently rated as more attractive across cultures. The red effect likely has evolutionary roots: red signals dominance in many species, ripe fruit, and blood. In UX design, red is used strategically for error states, urgent notifications, and high-priority calls-to-action because of its unmatched ability to capture attention.