.STRUCTURE IS ACTUALLY TREATING Americans to all sort of eyeglasses. On April 8th thousands experienced a total photovoltaic eclipse. Numerous are going to be less magnetized when, in the coming days, trillions of cicadas seem in the country's Midwest and south-east. The throng will certainly be extraordinarily large because pair of types of the bug-- Brood XIII and Family XIX-- are arising concurrently. The final time they appeared simultaneously resided in 1803, when Thomas Jefferson was actually president. Why do the cicadas possess such an unusual life process?