Rld, nice quote from Gould, the wise dude indeed that he was. But I still like the line of argument that theories are our human efforts to make sense of observations and processes. This means it is quite pointless to ask if they are true or false, because such a question implies they will or will not correspond perfectly to observations and processes. But theories don't work that way, in the sense of 1 to 1 correspondences. Rather, they are approximations. As such, evolution can be said to be the best, most reliable, least disconfirmed approximate account of known observations and processes associated with organisms on our planet. The language of truth and falsity, when applied to theories, makes it too easy for creationists - for instance - to take any kind of non-perfect-correspondence as evidence for falsity, when in fact it is just evidence for what all theories share, that they don't perfectly correspond with sets of observations and processes they seek to explain.