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A mysterious weather pattern stalks Earth's tropics. Every 30-60 days, something called the Madden-Julian oscillation (MJO) circles the equator, bringing rain and wind wherever it goes. Discovered in 1971, but still not completely understood, the MJO is the biggest driver of tropical weather. Scientists are making progress in understanding this hidden force in weather and climate. [Source: Science / AAAS]
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