"Humans can observe what and where something happens around them with their hearing, as long as sound frequencies lie between 20 Hz and 20 000 Hz." I wish. Thi

"Humans can observe what and where something happens around them with their hearing, as long as sound frequencies lie between 20 Hz and 20 000 Hz." I wish. This might be true if you are very young, but deteriorates rather fast. In a related vein, I was curious whether this would be something miraculous that made humans hear the actual frequencies over 20kHz somehow, but it's of course the much more likely interpretation: High frequencies are aliased down into lower frequencies where you can then hear them normally. Still seems to have cool applications, and if I understand correctly, it's going through great length to make the sounds still intuitively localizable, which must make for a neat experience.