Wave-particle duality/quantum mechanics have different interpretations, but since "the math works" and there's nothing better, thats what they go with.
One way of thinking of it - everything is a wave until you make a measurement. Then you get a "collapse" (localization) of the wavefunction. Which leads to the question of why the wave function collapses - i.e. how does nature know we want to make a measurement.
Which leads to all sorts of crazy ideas like the simulation hypothesis. Which is not a scientific theory, because you can't falsify it, but even very educated people like Neil DeGrasse Tyson have remarked on it.
One way of thinking of it - everything is a wave until you make a measurement. Then you get a "collapse" (localization) of the wavefunction. Which leads to the question of why the wave function collapses - i.e. how does nature know we want to make a measurement.
Which leads to all sorts of crazy ideas like the simulation hypothesis. Which is not a scientific theory, because you can't falsify it, but even very educated people like Neil DeGrasse Tyson have remarked on it.