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\begin{abstract}  \par By using entangled photons produced by a spontaneous parametric down conversion crystal, the CHSH-Bell inequality was measured to be $-2.743 $2.743  \pm 0.041$ for $\psi_+$ and $2.602 $-2.602  \pm 0.041$ for the $\psi_-$ state, thereby achieving a sigma of 14 and proving that local hidden variable theory is inconsistent with the physical reality. \end{abstract}