>On the other hand, if you define a "sound" as "something that is heard" then of course, if nobody hears the radio or the tree falling, then there's no sound.

That was my thinking. What you said makes complete sense, so I can see how both my cousin and myself could be correct. It's just...hmm...I've always thought of "sound" as actually HEARING it...and well, you pretty much took the words outta my mouth, so yeah. LOL. :)

~Den-"I want some cotton candy"Kara