well of course, it means it might not exist. and yes they are aware of,
and strongly suspect/suggest, that possibility. Still, scientifically,
just because you can't prove something doesn't mean it doesn't exist.
HOWEVER, you certainly cannot go around saying something exists without
proving it.

Lucia

> I disagree.  If something has not been proven to exist, that most
> certainly DOES mean that it might not exist.  What is being found
> might be just an experimental artifact of some sort.  The Perth Group
> seems, from what I've read, to be well aware of that possibility.
>
> Carol
>