Cicadas are back after nearly 17 years underground. Here's everything you need to know about the very noisy and unique Brood X.

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It's a debut that's been 17 years in the making, and in a matter of weeks, it's one that will grab the attention of millions of Americans.

Billions of periodical cicadas will emerge across 15 states and Washington, D.C., with some possibly coming out as early as late-April or the first week of May, said Gene Kritsky, a periodical cicada expert and dean of Behavioral and Natural Sciences at Mount St. Joseph University in Cincinnati.

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