How do cicadas make their signature sound, so eerie and amazingly loud?

The most noticeable part of the cicada invasion blanketing the central United States is the sound—an eerie, amazingly loud song that gets in a person’s ears and won’t let much else in. The most noticeable part of the cicada invasion blanketing the central United States is the sound—an eerie, amazingly loud song that gets in a person’s ears and won’t let much else in. Plants & Animals Phys.org – latest science and technology news stories