A group of cicadas called the Brood X or Brood 10 have started to emerge in the eastern US after 17 years underground. ThePrint’s Sandhya Ramesh explains why these insects have such a long life cycle, what happens when they emerge, and the growing concern about their changing lifecycles and numbers.

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These insects are climbing out of the ground after 17 years only to mate and die in weeks: https://theprint.in/science/these-insects-are-climbing-out-of-the-ground-after-17-years-only-to-mate-and-die-in-weeks/664939/----more----Prime numbers protect Brood X cicadas from everything but zombie fungus: https://www.livescience.com/periodical-cicada-prime-numbers.html