"No body of knowledge needs an organizational policy. Organizational policy can only impede the advancement of knowledge. There is a basic incompatibility between any organization and freedom of thought."

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In my opinion the separation of the c- and ac-stars is the most important advancement in stellar classification since the trials by Vogel and Secchi ... To neglect the c-properties in classifying stellar spectra, I think, is nearly the same thing as if a zoologist, who has detected the deciding differences between a whale and a fish, would continue classifying them together.

— Ejnar Hertzsprung