How does quantum theory explain all of the chemistry and most of physics? Why does this theory upset common sense? At the sub-atomic level, one particle seems to know what others are doing, so-called non-locality, and there is a limit on how accurately nature can be observed, says Heisenberg's uncertainty principle. Yet the theory is amazingly accurate and widely applied.Introducing Quantum Theory takes us on a step-by-step tour with the key players - Planck, Einstein, Bohr, Heisenberg, Schrodinger and others. Each contributed at least one crucial concept to the theory. The puzzle of the wave-particle duality is here along with description of the two questions raised against Bohr's Copenhagen Interpretation...the famous "dead and alive cat" and the EPR paradox. Both remain unresolved at the end of the 20th century. Read Less