(This is a series about a real-life Bigfoot habituation situation in the Midwest and the man who has learned to coexist in a most playful and remarkable way). Prior installments - #1 Home (Not) Alone #2 Tootsie Pops and Bacon #3 Little Andy the Klepto Peeping Tom #4 The Hairy Owl Ladies #5 The Coyote Men and the Sentinels #6 Night Moves Infrasound: Sound waves at a frequency lower than the human ear can perceive. ( SOURCE LINK ) As humans, we can hear the rumble of distant thunder but can’t hear the crack of lightning unless it strikes close by. We hear the bass but not the treble because powerful low-frequency sound travels long distances well. But the bass humans hear cuts off at about 20 Hz – below that, you can only feel the sound at close range as it vibrates your chest. If we were capable of hearing bass frequencies lower than 20Hz, we would be able to hear our own muscles moving. In comparison, there are many animals who appear to hear and produce sounds we...