.TYPE IS Caring For Americans to all kinds of spectacles. On April 8th millions watched a total photovoltaic eclipse. A lot of will be actually much less knocked out when, in the coming times, mountains of cicadas appear in the nation's Midwest and also south-east. The flock will certainly be abnormally large considering that pair of kinds of the pest-- Brood XIII and also Family XIX-- are developing concurrently. The final time they showed up concurrently resided in 1803, when Thomas Jefferson was actually head of state. Why carry out the cicadas have such an unique life cycle?