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What do the numbers tells us about how to be healthy in pregnancy - is it really important to cut out caffeine? And how can statistics guide you when trying to choose the best school for your children? Tim Harford talks to Charles Wheelan, the author of the book Naked Statistics. Men think about sex every seven seconds - a ‘fact’ has been repeated time and again in songs, articles and advertising. But is it true? Tim Harford speaks to Terri Fisher, professor of psychology at Ohio State University in the United States, who has carried out experiments to try to find out.