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Zebra stripes aren't just for good looks: it turns out, they actually repel flies. Why and how does it work? Biologists still aren't exactly sure, but a new study closes in on why the insects that pester Savannah animals zig when anything zags: https://t.co/NNkAm8EyvU 📸: Getty https://t.co/4pqbjCu9lQ — PolitiTweet.org