• Some scientists find, or so it seems, that they get their best ideas when smoking; others by drinking coffee or whisky. Thus there is no reason why I should not admit that some may get their ideas by observing, or by repeating observations.

    Karl Popper, W.W. Bartley, III (2013). “Realism and the Aim of Science: From the Postscript to The Logic of Scientific Discovery”, p.36, Routledge