.STRUCTURE IS Curing Americans to all type of eyeglasses. On April 8th millions saw a complete photovoltaic eclipse. Numerous will definitely be much less charmed when, in the coming days, mountains of cicadas seem in the country's Midwest as well as south-east. The throng will definitely be abnormally sizable given that 2 types of the insect-- Brood XIII and also Family XIX-- are actually surfacing concurrently. The final opportunity they seemed concurrently was in 1803, when Thomas Jefferson was president. Why perform the cicadas possess such an unusual life process?