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As many people prepare to celebrate Valentine's Day, Â鶹Éç Science correspondent Pallab Ghosh examines the science behind the theory of soulmates. What do science, research - and mathematics - tell us about whether finding The One is a real concept, or a bar to true happiness? Â鶹Éç InDepth is the home of the best news analysis, with fresh perspectives that challenge assumptions and deep reporting on the biggest issues of the day. You can find more articles from InDepth - like this one - on the Â鶹Éç News website and app. (Image: Getty)