.STRUCTURE IS Attending To Americans to all sort of eyeglasses. On April 8th thousands watched a total solar eclipse. Lots of will be actually less magnetized when, in the coming days, mountains of cicadas appear in the country's Midwest and also south-east. The flock will certainly be actually abnormally large given that 2 forms of the insect-- Family XIII and also Brood XIX-- are arising at the same time. The last opportunity they seemed all at once resided in 1803, when Thomas Jefferson was president. Why perform the cicadas possess such an unique life cycle?