.TYPE IS TREATING Americans to all type of spectacles. On April 8th thousands saw a complete sunlight eclipse. Many are going to be actually much less mesmerized when, in the coming days, mountains of cicadas appear in the nation's Midwest as well as south-east. The flock will definitely be extraordinarily huge considering that pair of kinds of the bug-- Brood XIII and Family XIX-- are surfacing simultaneously. The final time they appeared simultaneously was in 1803, when Thomas Jefferson was head of state. Why do the cicadas have such an uncommon life process?