.TYPE IS Attending To Americans to all kinds of spectacles. On April 8th thousands saw a complete photovoltaic eclipse. Several will be much less knocked out when, in the coming days, trillions of cicadas seem in the nation's Midwest and south-east. The flock will definitely be actually uncommonly sizable due to the fact that two kinds of the insect-- Brood XIII and Family XIX-- are developing at the same time. The last time they appeared together was in 1803, when Thomas Jefferson was actually president. Why perform the cicadas have such an uncommon life process?