High Quality Content by WIKIPEDIA articles! Quantum mechanics explains the behaviour of matter and energy on the tiny scale of atoms and subatomic particles. As physicist Stephen Hawking wrote in 2001, quantum mechanics is: the basis of modern developments in chemistry, molecular biology, and electronics, and the foundation for the technology that has transformed the world in the last fifty years.:26. In the late 19th century, classical physics appeared to explain just about everything. But during the 20th century observers found that assertion to be untrue — in both the large (macro) and the small (micro) worlds. This article describes how the limitations of classical physics were discovered, and describes the main concepts of the quantum theory that replaced it in the early decades of the 20th century. These concepts are described in roughly the order that they were first discovered; for a more complete history of the subject, see History of quantum mechanics.

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