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When is it more difficult to answer a puzzling question? Is it so when you can find no answers? Or, is it the case when you may have multiple competing theories but none seem to answer the question satisfactorily? In case of the puzzle of Zebra stripes – the latter case applies; from Rudyard Kipling to evolutionary scientists, several people have puzzled over why Zebras of all equids have stripes. This article gives a plausible explanation.

http://www.newyorker.com/online/blogs/elements/2014/04/how-zebras-got-their-stripes.html

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