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Now Playing: 1-23-14 Marketplace Tech - 'Optimal Cupid'

Online dating websites use all kinds of technology and calculations to help you find a mate. It could be as simple as giving a thumbs up or thumbs down to a photo, or as complicated as a long list of questions asked, points scored, and intense mathematical algorithms that play digital matchmaker. Mathematician Chris McKinlay was working on his doctorate and his love life at the same time, and found that he was unsatisfied with the calculations made. So he hacked an answer and in the process wrote "Optimal Cupid: Mastering the Hidden Logic of OkCupid."