When can you detect quantum coherence at macroscopic scales ?
While the seemingly " exotic " behavior of matter posited by quantum mechanics and relativity theory become more apparent when dealing with particles of extremely small size or velocities approaching the speed of light , the laws of classical , often considered " Newtonian " , physics remain accurate in predicting the behavior of the vast majority of " large " objects ( on the order of the size of large molecules or bigger ) at velocities much smaller than the velocity of light .