Preparing underground for 17 years, cicadas are born and then quickly take refuge underneath the surface. The insects will feast on tree roots until they make their way aboveground once again after a long hiatus. It was just last year when we were reporting on the massive invasion of Brood V cicadas that were emerging all over Maryland. The short-lived spectacle is one we don’t frequently see throughout our lifetime, with the next mass of them to appear in 2021. But in the past week an undetermined group of cicadas has emerged, leaving scientists puzzled over their early arrival.