I'm always surprised at the facts or ideas I learn about while researching for stories, and I am curious what other people have gleaned from their time trying to write. So please, share the strangest, most interesting, or most profound fact or idea or fact you have learned while trying to create. I'll start. The sound of a Tiger's roar or growl is only a small part of the total acoustics they can produce. They use infrasound as a form of long range communication with other Tigers, or can use infrasound to paralyze prey.