.STRUCTURE IS Attending To Americans to all sort of spectacles. On April 8th thousands saw an overall solar energy eclipse. A lot of will be actually less charmed when, in the coming days, trillions of cicadas seem in the country's Midwest and south-east. The flock will be actually abnormally huge due to the fact that pair of types of the pest-- Brood XIII as well as Brood XIX-- are arising all at once. The last opportunity they appeared all at once resided in 1803, when Thomas Jefferson was actually head of state. Why do the cicadas possess such an unusual life cycle?