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String figures are one of our human universals, as basic as food and language. When we play with a loop of string, we are viscerally connected to ancient cultures worldwide and inevitably to our own ancestors. String games saved the lives of fighter pilots in World War II and can unite us with strangers anywhere today. By fostering ambidexterity, string figures also enable us to integrate our receptive and assertive sides and help us transcend gender stereotypes. Reconnect to childhood and open up the world of higher mathematics through learning to have "Hard Fun!"