.NATURE IS Curing Americans to all kinds of spectacles. On April 8th millions observed a total sunlight eclipse. Several will be actually less charmed when, in the coming times, trillions of cicadas show up in the nation's Midwest as well as south-east. The swarm will be uncommonly big given that 2 kinds of the insect-- Brood XIII as well as Family XIX-- are emerging all at once. The final time they showed up together remained in 1803, when Thomas Jefferson was actually head of state. Why do the cicadas have such an uncommon life cycle?