I would say that something is not a fact if its validity can be questioned.
This would mean that most things in science are /not/ fact. I'd agree
with that - most of it's conjecture, hypothesis and modelling systems.
> Before atomic physics, wasn't it a fact that matter was
> solid, all the way through?
Nope, it was beleived, but it wasn't true, so it wasn't a fact.
> > > Are facts and fact judgements an integral
> > > part of your mental landscape?
> >
> > I don't know, to tell the truth :)
>
> Is that a fact?
Question it if you like.
Drakir