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sep 6 at 17:46Can Noether's theorem be understood intuitively?
feb 16 '12 at 11:25A list of inconveniences between quantum mechanics and relativity?
dec 5 '11 at 9:31Did Einstein prove $E=mc^2$ correctly? [closed]
may 23 '11 at 9:14Is anti-matter matter going backwards in time?