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Quote from Sheldon in the episode The Locomotion Reverberation

Sheldon: Leonard, in the world of theoretical physics, you never finish; so much is unprovable.
But when I was studying that railway guide, it was so tangible and so satisfying that something just clicked. Then it clacked. Then it clicked, then it clacked, click-clack clickety-clack, and here we are. Whoo-whoo!

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