.TYPE IS Attending To Americans to all type of eyeglasses. On April 8th thousands watched a complete photo voltaic eclipse. Numerous will definitely be much less knocked out when, in the coming times, mountains of cicadas show up in the country's Midwest and south-east. The flock will be actually abnormally large because 2 types of the pest-- Family XIII and Family XIX-- are emerging simultaneously. The last opportunity they appeared concurrently remained in 1803, when Thomas Jefferson was actually head of state. Why do the cicadas possess such an unusual life cycle?