Abstract: In the wide range of materials that are grouped under the heading of “Quantum Matter”, intrinsic electronic charges and spins conspire in weird and collective ways to create new materials properties. Magnetic fields are a valuable tool for probing the mysteries that remain at the heart of Quantum Matter, where Nature creates 1/3 fractional electric charges, “spin liquids” of fixed charges but mobile spins, and high-temperature superconductivity in which the very existence of electrons as distinct particles becomes uncertain.