.NATURE IS Attending To Americans to all type of spectacles. On April 8th millions saw a complete sun eclipse. Many are going to be much less mesmerized when, in the coming times, mountains of cicadas show up in the country's Midwest and also south-east. The throng is going to be uncommonly big considering that 2 kinds of the insect-- Brood XIII and also Family XIX-- are actually emerging simultaneously. The last opportunity they showed up all at once remained in 1803, when Thomas Jefferson was president. Why perform the cicadas possess such an uncommon life process?