.NATURE IS TREATING Americans to all type of eyeglasses. On April 8th thousands witnessed an overall solar eclipse. Lots of are going to be actually less knocked out when, in the coming days, mountains of cicadas seem in the nation's Midwest as well as south-east. The throng will be abnormally sizable because two types of the insect-- Family XIII and also Brood XIX-- are developing at the same time. The last opportunity they showed up simultaneously resided in 1803, when Thomas Jefferson was president. Why do the cicadas possess such an uncommon life process?