"An expert is someone who knows some of the worst mistakes that can …"

An expert is someone who knows some of the worst mistakes that can be made in his subject, and how to avoid them.

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Natural science, does not simply describe and explain nature; it is part of the interplay between nature and ourselves.

— Werner Heisenberg

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What we observe is not nature itself, but nature exposed to our method of questioning.

— Werner Heisenberg

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Ce que nous observons, ce n'est pas la Nature en soi, mais la Nature exposée à notre méthode d'investigation.

— Werner Heisenberg