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dec 28 at 19:09What physical forces pull/press water upwards in vegetation?
jul 12 at 9:13What is the fallacy in this infinite motion machine?
apr 4 '12 at 16:34Why does holding something up cost energy while no work is being done?
sep 8 '11 at 15:39Where do magnets get the energy to repel?
sep 4 '11 at 4:20Common false beliefs in Physics
apr 15 '11 at 7:52Are human eyes the best possible camera?