“Physics is not only a history of successes.”

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This is the world is described by quantum mechanics and particle theory. We have arrived very far from the mechanical world of Newton, where minute, cold stones eternally wandered on long, precise trajectories in geometrically immutable space. Quantum mechanics and experiments with particles have taught us that the world is a continuous, restless swarming of things, a continuous coming to light and disappearance of ephemeral entities. A set of vibrations, as in the switched-on hippie world of the 1960s. A world of happenings, not of things.

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Physics is not only a history of successes.

p. 63
Time sits at the center of the tangle of problems raised by the intersection of gravity, quantum mechanics, and thermodynamics. A tangle of problems where we are still in the dark. If there is something that we are perhaps beginning to understand about quantum gravity that combines two of the three pieces of the puzzle, we do not yet have a theory capable of trying to gather all three pieces of our fundamental knowledge of the world.

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