A contentious piece of clothing: Members of the Iranian women's soccer team celebrate their win over Syria back in 2007. That year, the international soccer league FIFA banned the wearing of hijabs during games. The ban was lifted in July. Mohammad Abu Ghosh/AP hide caption

itoggle caption Mohammad Abu Ghosh/AP

We can all work up a stinky sweat — welders, ballerinas and number-crunchers alike. Would you want to know? emreogan/iStockphoto hide caption

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Posting a picture like this on the fridge might seem like good motivation for weight loss. But scientists say it might instead inspire weight gain. iStockphoto.com hide caption

itoggle caption iStockphoto.com