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" ... “Quanta” are discrete chunks, by definition, but not everything becomes chunky or indivisible on short scales. Electromagnetic waves are made of quanta called “photons,” so the waves can be thought of as being discretized. And electron shells around the atomic nucleus can only have certain discrete radii. But other particle properties do not become discrete even in a quantum theory. The position of electrons in the conducting band of a metal for example is not discrete – the electron can occupy any continuous location within the band. And the energy values of the photons that make up electromagnetic waves are not discrete either. For this reason, quantizing gravity – should we finally succeed at it – does not necessarily mean that space and time have to be made discrete. (But, on the other hand, they might be.) ... "