.STRUCTURE IS ACTUALLY TREATING Americans to all kinds of spectacles. On April 8th thousands saw an overall photovoltaic eclipse. A lot of are going to be much less charmed when, in the coming days, mountains of cicadas show up in the nation's Midwest and south-east. The throng will definitely be actually extraordinarily huge given that two forms of the bug-- Family XIII as well as Family XIX-- are actually arising at the same time. The last time they seemed simultaneously remained in 1803, when Thomas Jefferson was president. Why perform the cicadas possess such an unique life cycle?