.TYPE IS TREATING Americans to all kinds of eyeglasses. On April 8th millions observed a complete solar energy eclipse. A lot of will certainly be actually less magnetized when, in the coming times, trillions of cicadas seem in the country's Midwest and south-east. The throng will be actually extraordinarily sizable given that 2 types of the pest-- Family XIII as well as Brood XIX-- are arising all at once. The last time they appeared together was in 1803, when Thomas Jefferson was president. Why do the cicadas possess such an unusual life cycle?