.TYPE IS ACTUALLY TREATING Americans to all kinds of spectacles. On April 8th millions saw a complete solar eclipse. Numerous are going to be actually much less knocked out when, in the coming times, trillions of cicadas appear in the country's Midwest and south-east. The throng is going to be abnormally sizable given that 2 forms of the insect-- Brood XIII as well as Family XIX-- are actually developing all at once. The final opportunity they showed up concurrently was in 1803, when Thomas Jefferson was actually head of state. Why do the cicadas possess such an uncommon life cycle?