|User Name||Thread Name||Subject||Posted|
|GUEST,mack/misophist||BS: Puzzles. can you help me? (80* d)||RE: BS: Puzzles. can you help me?||04 Dec 04|
The tree bit is quite old. Bishop Berkeley started it, I think. The answer depends on how you want to define sound. And whether you want to bring in the quantum observer effect. I suggest you don't.