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Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems.

— Niels Bohr Atomic Physics and the Description of Nature (1934)

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More quotes by Niels Bohr

It is a great pity that human beings cannot find all of their satisfaction in scientific contemplativeness.

Chandra: A Biography of S. Chandrasekhar‎ (1991)

Some subjects are so serious that one can only joke about them.

The Genius of Science: A Portrait Gallery (2000)

Physics is to be regarded not so much as the study of something a priori given, but rather as the development of methods of ordering and surveying human experience.

An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.

I go into the Upanishads to ask questions.

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