“Wonderful theory, wrong species.”

“The modern world is devoted to vanishing species, vanishing weather and vanishing capacity for wonder.”

“If enough data points trouble the theory, the theory may be wrong. If the theory is basic, the paradigm may have to change.”

“I have noticed that this kind of fanatic, like every other kind, is in two species: the species which too clearly thinks out its own insane theory, and the species which remains perfectly muddle-headed.”

“Karl Marx was right, socialism works, it is just that he had the wrong species”

“If two opposite theories are propagated one will be wrong.”

“Progress in science is often built on wrong theories that are later corrected. It is better to be wrong than to be vague.”

“But the facts are unquestioned. The aeroplane does these things, and if the theory does not give warranty for the practice, then it is the theory which is wrong.”

“If the evidence says you’re wrong, you don’t have the right theory. You change the theory, not the evidence.”

“It seemed that she had not so much misjudged the woman as assigned her to completely the wrong species.”