Ferrocarrilla del Norte - To what extent the quantum effect?

Quantum influences atoms and small particles. On the contrary, in ordinary objects, in the macroscopic world, the quantum effects are not noticeable. Where is the boundary between these two? Below what size is quantum physics dominant for a physical description?

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Bidali zure helbide elektronikoa eta jaso asteroko buletina zure sarrera-ontzian

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