.TYPE IS Attending To Americans to all kinds of spectacles. On April 8th thousands saw an overall photo voltaic eclipse. A lot of will certainly be actually much less charmed when, in the coming days, mountains of cicadas seem in the nation's Midwest and also south-east. The flock will be abnormally huge since two types of the pest-- Brood XIII as well as Brood XIX-- are actually developing simultaneously. The final opportunity they seemed simultaneously was in 1803, when Thomas Jefferson was actually president. Why carry out the cicadas have such an unusual life cycle?