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       xkcd - A Webcomic - Physics vs. Magic (2904)
        
       Image:
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       'At the stroke of midnight, your brother will be hurtling
       sideways at an altitude of 150 meters' is a regular physics
       prediction about your nonmagical trebuchet, whereas 'you are
       cursed to build a brother-launching trebuchet' falls out of the
       Lagrangian.
        
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