albert einstein portrait theoretician physician scientist personality of the 20th century e mc2 equation professor theory of relativity general relativity quantum mechanics brownian motion 1921 nobel prize in physics 1925 medal copley max-planck medal 1929 genius intelligent thinker head face big man old man white hair celebrity famous person birth death 1879 to 1955 76 years historical figure vintage fair impartial unbiased unprejudiced non-racist free pictures free photos free images royalty free free illustrations public domain
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