Quantum mechanics is a branch of physics concerned with the behavior of atoms and subatomic particles. It attempts to discover, describe and model how these particles interact with each other and their environment. Subatomic particles do not obey the same laws of physics as larger objects: they can exist in multiple states simultaneously and can affect each other at great distances (which is known as "entanglement"). This field of study has contributed to many technological advancements, such as transistors and lasers.
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