Okey hear this. someone came into my shop and stole $100 from the register without my knowledge. the same person came back with the same $100 5 minutes later and he bought $70 in items and i give him back $30 change. how much money did i

Quantum mechanics is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles.[2]:1.1 It is the foundation of all quantum physics including quantum chemistry, quantum field theory, quantum technology, and quantum information science.