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Einstein said that the reason for the construction of general relativity was the choice of inertial movements within special relativity was not enough; on the other hand, a theory that has no such particular state of motion should be more satisfactory. In 1907, Einstein released an article on acceleration under special relativity. In that article, he proposed that free fall is fundamentally an inertial motion. Rules of special relativity must apply to free-falling observers. This principle is called the equivalence principle. In the same article, he predicted gravitational time dilation, light deflection, and gravitational redshift.