With a swarm of determined zerglings, a Brood War is currently underway on the East coast. Brood II, a cohort of slumbering cicadas, recently made their way out of the ground in the billions to outnumber the humans in their path 600 to 1 (but don't be surprised if you don't see any). Even more amazing than their numbers is how long the cicadas have waited to emerge. Every 13 or 17 years—depending on the brood, of which there are 15—they flood the trees, shrubbery, and streets with deafening sex sonatas. The cicadas have waited nearly two decades for a few weeks of procreation.