Nymph cicadas crawl on the hand and arm of a researcher after being collected in order to test them for toxins during a study from the University of Indiana investigating the insects absorption of pollutants in soil as Brood X or Brood 10 cicadas have begun emerging from the ground after 17 years, in Bloomington, Indiana, U.S., May 21, 2021. Picture taken May 21, 2021. REUTERS/Cheney Orr