"Humor is the easiest to achieve; the 'heart' is always the toughest, because you can't tell people to feel a certain way."

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The history of science shows that the progress of science has constantly been hampered by the tyrannical influence of certain conceptions that finally came to be considered as dogma. For this reason, it is proper to submit periodically to a very searching examination, principles that we have come to assume without any more discussion.

— Louis de Broglie