If a tree falls in a forest and there is no-one there to hear it, did it make a sound?

Question: If a tree falls in a forest and there is no-one there to hear it, did it make a sound?
- Keywords:
  forest,
  philosophy,
  sound,
  tree
Asked by gnome to Asif, Laura, Lena, Sean, Viv on 16 Mar 2012.
- Lena Ciric answered on 15 Mar 2012:
  
  The sound waves would still be created so, yes, there would be a sound. There would just be nobody there to hear it.
- Viv Lyons answered on 15 Mar 2012:
  
  It has been argued that it makes waves but sound occurs when the waves hit an ear drum, so maybe they don’t.
- Laura Waters answered on 16 Mar 2012:
  
  If a squirrel was nearby it would hear it.
- Sean Murphy answered on 19 Mar 2012:
  
  Good question! This is an age old philosophical thought experiment that raises questions regarding observation and knowledge of reality. what do you think?

Question: If a tree falls in a forest and there is no-one there to hear it, did it make a sound?