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High above Earth's tropics, a pattern of winds changed recently in a way that scientists had never seen in more than 60 years of consistent measurements. This disruption to the wind pattern - called the "quasi-biennial oscillation" - did not have any immediate impact on weather or climate as we experience it on Earth's surface. But it does raise interesting questions for the NASA scientists who observed it: If a pattern holds for six decades and then suddenly changes, what caused that to happen? Will it happen again? What effects might it have? [Source: NASA]
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