.NATURE IS ACTUALLY TREATING Americans to all sort of spectacles. On April 8th millions witnessed a complete solar energy eclipse. A lot of will be actually much less charmed when, in the coming times, mountains of cicadas seem in the country's Midwest as well as south-east. The swarm is going to be unusually big given that two types of the pest-- Brood XIII as well as Brood XIX-- are developing at the same time. The final time they appeared at the same time remained in 1803, when Thomas Jefferson was actually president. Why carry out the cicadas possess such an unusual life cycle?