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Published online by Cambridge University Press: 25 May 2016
A respected astronomer recently suggested, because the whole spectrum has been explored, that the heroic days of astronomy are now over. I will try, by referring to the narrow optical and 21-cm windows with which I am familiar, to argue that the he was quite wrong. We still haven't covered the whole spectrum, and in any case prejudices, biases and selection effects could still veil much of the truth from sight.