The sight and sound of trillions of cicadas surfacing across much of the U.S. — a massive invasion of two separate groups called broods emerging at the same time — has scientists buzzing. While there is not extensive overlap between the two broods, some regions, especially in America's heartland, will experience a double-whammy of cicada occupation, experts told ABC News. https://abcnews.visitlink.me/scfA3j | ABC News