After Eclipse: Nature's next big show — cicada double emergence

The sight and sound of trillions of cicadas surfacing across much of America, a massive invasion of two separate groups called broods emerging at the same time, has scientists buzzing. For the first time in more than 200 years, two broods -- Brood XIX, known as the "Great Southern Brood," and Brood XIII, known as the "Northern Illinois Brood" -- will emerge from the ground simultaneously. While there is not extensive overlap between the two broods, some regions, especially in America's heartland

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