ABSTRACT
Does a tree falling in the forest make a sound when no one is around to hear it? e question is familiar to every undergraduate. One natural response is that of course the tree makes a sound – why shouldn’t it? e tree makes a sound whether anyone is on hand to hear it or not. And, in any case, even if there are no people about, there are squirrels, birds, or at the very least bugs that would hear it crashing down.
