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Tim Harford asks whether claims that keen runners might be damaging their health are really true? Joggers will find comfort from an analysis of the numbers by Alissia White of consulting firm Bazian. And is infidelity among cruise ship passengers rife? A survey claims that one in five passengers admits to cheating on their partner on a cruise and that in 80% of those cases, their partner was on board. But a closer look at the story shows the truth is not nearly so scandalous. (Photo: Older couple running together outdoors. Credit: Science Photo Library)