![](http://static.ddmcdn.com/gif/geographic-tongu2-250x250.jpg)
Known as geographic tongue, the condition causes red, patchy shapes to appear on the tongue.
![](http://static.ddmcdn.com/gif/human-face-250x250.jpg)
A 3D analysis of wrinkles and other signs of aging could
reveal a person's age based on only an image of his or her face.
![](http://r.ddmcdn.com/w_160/w_640/h_360/gif/videos/dnews-swimvsrun-hero.jpg)
Would you rather run or splash around in water to keep
yourself in tip-top shape? Opinion is likely to be divided, and highly
subjective, as devotees of each weigh in. Luckily, though, science has
an opinion too.
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