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David Zaslavsky earned this badge 6 times
jan 19 at 5:02Double light speed
nov 29 at 2:24Getting started general relativity
may 7 '12 at 18:47Book recommendations
jun 16 '11 at 13:23Why is there a scarcity of lithium?
jun 3 '11 at 18:41How Does Mass Leave the Body When you Lose Weight?