.TYPE IS ACTUALLY TREATING Americans to all kinds of spectacles. On April 8th thousands observed an overall photovoltaic eclipse. A lot of will certainly be much less mesmerized when, in the coming days, mountains of cicadas show up in the country's Midwest as well as south-east. The throng will certainly be uncommonly large since two forms of the bug-- Family XIII as well as Family XIX-- are surfacing concurrently. The final time they seemed simultaneously was in 1803, when Thomas Jefferson was head of state. Why perform the cicadas possess such an unique life cycle?