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Radio receivers cannot detect sound. Sound is wave in the atmosphere, radio is an electromagnetic wave.

I don't know what brand he uses but the function is the same. Lightning triggers for cameras work off of the burst of infrared light milliseconds before you see the flash / bolt of lightning. The photographers do not have a 'lightning fast' finger on the shutter button. Planet Earth has over 3,000,000 lightning flashes per day.

If Bigfoot is really out there esp. in some high numbers, we should see traces in footprint evidence commonly. That is, we see tracks of all kinds of animals even when they are not obvious on some trail or wooded area. From time-to-time we should be seeing Bigfoot tracks if something like Bigfoot is out there. I never understood why some need to think this tree broken branch thing (obvious and common) has to be attributed to Bigfoot. It's likely a common and unrelated to Bigfoot. For those who need this to be a sign. I would suggest if you had enough (or any) tracks and other sensible traces of Bigfoot, you wouldn't need to imagine these trees = bigfoot. Not every little scrap of stuff that washes up on an island is Amelia Erhart wreckage. To sum it up the movie What about Bob stated it best in this joke: Bob Wiley: [telling a joke] The doctor draws two circles and says "What do you see?" the guy says "Sex." So the doctor draws trees, "What do you see?" the guy says "sex". The doctor draws a car, owl, "Sex, sex, sex". The doctor says to him "You are obsessed with sex", he replies "Well you're the one drawing all the dirty pictures!"