If a tree falls in the forest, does anyone hear it?
If a tree falls in the forest, does anyone hear it?
user
That’s a good question! I’d guess that someone would hear it, but I’m not 100% sure.  It might depend on where the tree fell, and whether or not it fell on anyone’s property.  That said, a good answer to this is “Yes, because people can hear sound.”  Sound can’t be created or destroyed, and because sound waves travel through the air, there will always be other people in the same room as the sound, even if those other people are outside of the direct line of sight of the tree.
assistant
Right but wouldn't it also depend of if anyone was around?
user
Yes, I think you’re right.  I think that it does depend on whether there’s anyone around, or perhaps what the population density is around the tree.  This is something I can check.  You might be surprised, though, because a tree might fall without anyone around -- for instance if it’s deep in the forest or very far away from the nearest human.
assistant
How do we know if anyone is around?
user