.STRUCTURE IS Attending To Americans to all type of eyeglasses. On April 8th thousands experienced a complete solar eclipse. A lot of will certainly be actually less knocked out when, in the coming times, mountains of cicadas appear in the nation's Midwest and south-east. The throng will be actually abnormally sizable due to the fact that two sorts of the bug-- Brood XIII and Family XIX-- are developing at the same time. The final time they showed up at the same time was in 1803, when Thomas Jefferson was head of state. Why do the cicadas possess such an unusual life process?