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I have to subscribe to Graham's last sentence, "But then do we really "understand" anything?"Here we are theorising all over the place. 'Quarks', 'black holes', 'dark matter', 'event horizons', 'singularities', the 'Higgs Boson', the 'Big Bang' etc etc etc. But do we understand them? Do they even exist?At the moment, I think our knowledge is limited; good grief, let's face it, we have only been looking at the universe with something slightly better than the naked eye for a few hundred years and only in the past 50 or so with anything substantially better than a mere nautical telescope.The theories we have now could be way off the mark. So I think it far too early to start wondering whether or not we can ever understand all there is to know and much of what we may 'learn' over the coming millennia may only be taken as 'fitting in' with other theories.But if there is one thing I think we can never understand, it is 'infinity'.