  I offer an account of how the quantum theory we have helps us explain so
much. The account depends on a pragmatist interpretation of the theory: This
takes a quantum state to serve solely as a source of sound advice to physically
situated agents on the content and appropriate degree of belief about matters
concerning which they are currently inevitably ignorant. The general account of
how to use quantum states and probabilities to explain otherwise puzzling
regularities is then illustrated by showing how we can explain single particle
interference phenomena, the stability of matter, and interference of
Bose-Einstein condensates. Finally I note some open problems and relate this
account to alternative approaches to explanation that emphasize the importance
of causation, of unification, and of structure.
