... quantum mechanics is a complete, unified, coherent, and mathematically super-elegant scheme for providing us with (probabilistic) answers to all … - Luboš Motl

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Perturbatively, fundamental strings are more fundamental than branes or any other objects. In that old-fashioned description, D-branes are "solitons" — configurations of classical fields that arise from the closed strings. They are analogous to magnetic monopoles — which may also be written as classical configurations of the "more fundamental fields" in field theory. In a similar way, D-branes' masses diverge for 𝑔→0. Non-perturbatively, D-branes and other branes are equally fundamental as strings. In fact, when 𝑔 is sent to infinity, some D-branes may become the lightest objects — usually strings of a dual (S-dual) theory. When we include very strongly coupled regimes (high values of the string coupling constant 𝑔), there is a brane democracy.

The actual heart of quantum mechanics is that the objects in its equations are connected to the observations very differently than the classical counterparts have been.