.STRUCTURE IS ACTUALLY Caring For Americans to all sort of spectacles. On April 8th millions saw an overall solar energy eclipse. Lots of will certainly be actually less magnetized when, in the coming days, trillions of cicadas show up in the nation's Midwest and also south-east. The flock will be abnormally sizable since two kinds of the insect-- Brood XIII and also Brood XIX-- are actually surfacing at the same time. The final time they showed up concurrently was in 1803, when Thomas Jefferson was actually head of state. Why perform the cicadas possess such an unique life cycle?