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
That’s a good question.  We can answer this question with both technology and philosophy.  One way to know if anyone is around is through technology -- like with a GPS or Internet.  We could also use our senses, which would be less reliable but potentially faster.  For example, we could send a helicopter or air plane above the forest to look, but this would take a lot of resources and time, and might not work very well if there’s a dense cloud-cover.
assistant
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
You’re asking a good question, I’m not entirely sure.  It sounds like you’re interested in learning more about what sorts of environmental sensors we have, such as for detecting the noise of a falling tree.  This is an important question, and my first thought is that there’s a lot of information about the sensors in use today.  But you can also try asking Google.  Is there something more you’re looking for?
assistant
If a tree falls in the forest, does anyone hear it?