Is being a good scientist a matter of what you do or of what you feel in your heart?

If the question posed in the title of the post seems to you to have an obvious answer, sit tight while I offer a situation in which it might be less obvious. We recently discussed philosopher Karl Popper’s efforts to find the line of demarcation between science and pseudo-science .

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Is being a good scientist a matter of what you do or of what you feel in your heart?