.STRUCTURE IS TREATING Americans to all kinds of spectacles. On April 8th millions saw an overall sunlight eclipse. A lot of are going to be actually less mesmerized when, in the coming times, mountains of cicadas appear in the country's Midwest and south-east. The swarm is going to be actually extraordinarily big due to the fact that pair of kinds of the bug-- Family XIII and Family XIX-- are actually developing simultaneously. The last time they appeared all at once resided in 1803, when Thomas Jefferson was actually president. Why do the cicadas possess such an uncommon life cycle?