<human>:  What are the distinctive features of quantum physics?
<bot>: One of the most distinctive features of quantum physics is the principle of superposition, which states that a quantum system can exist in many different states at the same time. This allows for the possibility of particles being in multiple places simultaneously, or being able to exist in many different energy states simultaneously. 2 Another distinctive feature of quantum physics is the idea of entanglement, which states that two entangled particles can affect each other no matter the distance between them. This means that a change in one particle can affect the properties of the other, even if they exist on opposite sides of the universe. 3 A third distinctive feature of quantum physics is the Heisenberg uncertainty principle, which states that it is impossible to know both the position and momentum of a particle at the same time with perfect accuracy. This means that it is impossible to measure the exact state of a quantum system and therefore impossible to predict its exact behavior.