The country is about to witness a phenomenon that hasn’t been seen since 1803: two different broods of hatching cicadas that stretch from the Southeast to the Midwest. According to WYFF4 in Greenville, South Carolina, this year “the Great Southern Brood and the 17-year periodical group known as Brood XIII of the Midwest will emerge at the same time.” The Great Southern Brood, or Brood XIX, hatches every 13 years, so the two populations are usually staggered.