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Bernhard Heijstek earned this badge 5 times
apr 22 at 8:14Books that every non-physicist should read
nov 27 at 12:56What software programs are used to draw physics diagrams, and what are their relative merits?
may 16 '12 at 21:34What Is Energy? Where did it come from?
jul 6 '11 at 21:08If you view the Earth from far enough away can you observe its past?