If you happen to be blessedly unfamiliar with the 17 year cicadas, let me enlighten you. They are a species of cicada (yes, those big googly-eyed bugs that make that only exist in order to make that annoying sound so you know it’s hot all summer long) that has evolved to emerge from the ground in force on a 17 year cycle. Unfortunately for us, that doesn’t mean they only come once every 17 years. Each brood comes every seventeen years, but there are overlapping swarms of these things.