Billions, maybe even a trillion, cicadas are set to emerge in a super rare double-brood event. This means two broods, Brood XIII (which shows up every 17 years) and Brood XIX (every 13 years), will pop out at the same time. Entomologists, who study bugs, divide cicadas into these "broods" to track when they emerge. Usually, different broods come out at different times, but this year, both will appear together, something that last happened 221 years ago in 1803. This amazing synchronicity won’t happen again until 2245, and these broods are conveniently located right next to each other.

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