.TYPE IS ACTUALLY Curing Americans to all kinds of spectacles. On April 8th millions witnessed a total photovoltaic eclipse. Many will be actually less mesmerized when, in the coming times, mountains of cicadas appear in the nation's Midwest as well as south-east. The throng will certainly be abnormally sizable since two sorts of the pest-- Brood XIII and also Family XIX-- are actually emerging all at once. The last time they showed up together resided in 1803, when Thomas Jefferson was actually head of state. Why carry out the cicadas possess such an unique life process?