.STRUCTURE IS ACTUALLY TREATING Americans to all sort of eyeglasses. On April 8th thousands experienced a total solar eclipse. Numerous are going to be less knocked out when, in the coming days, mountains of cicadas seem in the nation's Midwest as well as south-east. The swarm will be actually unusually sizable since two sorts of the pest-- Brood XIII as well as Family XIX-- are actually emerging simultaneously. The final opportunity they appeared simultaneously resided in 1803, when Thomas Jefferson was head of state. Why do the cicadas possess such an unusual life process?