Explaining The Universe on Instagram: "Quantum mechanics is the branch of physics that describes how matter and energy behave on the smallest scales—atoms, electrons, photons, and other subatomic particles. Unlike the predictable motion seen in everyday life, the quantum world is governed by probabilities: particles don’t have exact positions or velocities until they’re measured, existing instead as “wavefunctions” that describe all possible outcomes. Phenomena like superposition, where a partic