By Janet Loehrke
Shreveport Times
For the first time since 1803, more than 1 trillion cicadas from two major broods will emerge from underground dormancy in mid-May and collectively create a loud, high-pitched buzz that will assault your ears for weeks.
The rare overlap in emergence – when cicadas arise from underground – is caused by two specific sets of cicadas. The largest, known as Brood XIX, appears every 13 years. Brood XIII emerges every 17 years.