.NATURE IS ACTUALLY TREATING Americans to all type of eyeglasses. On April 8th thousands observed a total photo voltaic eclipse. A lot of will certainly be less mesmerized when, in the coming times, trillions of cicadas seem in the nation's Midwest and south-east. The swarm will certainly be actually uncommonly sizable due to the fact that 2 types of the insect-- Family XIII and Family XIX-- are actually surfacing all at once. The last time they appeared concurrently was in 1803, when Thomas Jefferson was president. Why carry out the cicadas have such an unique life process?