.STRUCTURE IS Caring For Americans to all kinds of eyeglasses. On April 8th millions observed a total sunlight eclipse. Many will definitely be much less magnetized when, in the coming days, mountains of cicadas seem in the nation's Midwest and south-east. The flock is going to be unusually sizable due to the fact that 2 sorts of the pest-- Family XIII and Brood XIX-- are actually developing concurrently. The last time they appeared together was in 1803, when Thomas Jefferson was actually head of state. Why perform the cicadas have such an unique life cycle?