Periodical cicadas, identified as Brood X, are back, providing us with a once-every-17-years opportunity to witness a remarkable natural phenomenon, as these insects emerge and breed, while producing sounds as loud as a jet engine.

Periodical cicadas, identified as Brood X, are back, providing us with a once-every-17-years opportunity to witness a remarkable natural phenomenon, as these insects emerge and breed, while producing sounds as loud as a jet engine.