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Mark Eichenlaub earned this badge 5 times
jan 8 at 15:38What exactly is heat?
aug 9 at 12:40Why does the atmosphere rotate along with the earth?
dec 4 '11 at 19:10Why doesn't the Moon fall upon Earth?
jul 9 '11 at 22:40A mirror flips left and right, but not up and down
may 31 '11 at 14:28What is the fallacy in this infinite motion machine?