ocr: à - C d. How I Came to Embark on My Great Work - Ihave been interested in the - * - scientific principles offorce and motion ever since I first witnessed the villagers -i - practicing their national sport. Their game, though both archaic and complex, quite manifestly involved surfeits ofboth force, and motion. The villagers' sport, set in a particularly interesting landscape, already employed a dangerous, yet intriguing, combination of mammoths and giant rolling balls.