HuffPost Senior Social Media Editor Kerstin Shamberg spotted this amazing Malia Obama photobomb while watching CNN. The older first daughter gets in front of her sister as she's taking a photo of a cute kiss between her parents in front of the White House.
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A handy flow chart that helps you figure out the age of an undated world map, by xkcd. Big pic.
As the infographic below shows, the answer is quite a lot. A lot of factors are at play when...
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