A cicada nymph moves in the grass, Sunday, May 2, 2021, in Frederick, Md. Within days, a couple weeks at most, the cicadas of Brood X (the X is the Roman numeral for 10) will emerge after 17 years underground. There are many broods of periodic cicadas that appear on rigid schedules in different years, but this is one of the largest and most noticeable. (AP Photo/Carolyn Kaster)
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