From: PointedEars@web.de   
      
   Thomas 'PointedEars' Lahn wrote:   
   > Bill Sloman wrote:   
   >> [Einstein] clearly didn't have the same idea in mind as Newton had.   
   >   
   > That much is true.  Based on special relativity he discovered that, contrary   
   > to Newtonian mechanics, objects can have energy even when they are not in   
   > relative motion, due to and proportional to their mass.  He wrote in 1905 in   
   > "Does the Inertia of a Body Depend Upon Its Energy Content?" (translated):   
   > "we are led to the conclusion: The mass of a body is a measure of its energy   
   > content" (it is that paper where E_0 = m c^2 comes from, even though he did   
   > not write it this way).   
   >   
   > You should read his papers once; they are quite instructive and at least the   
   > first ones are written so that even laypeople can understand them (with some   
   > intellectual effort):   
   >   
   >    
   >   
   > (Unfortunately, the Digital Einstein Archives are being commercialized now,   
   > so free versions of the official translations and the original papers are   
   > currently only available via the Internet Archive and some private   
   > repositories, respectively.)   
      
   I just noticed that turning the page in the archived version of the official   
   translation no longer works, so you cannot read the whole paper *that* way.   
   But you can modify the URI (in your browser's Address Bar if it has one) to   
   read the subsequent two pages of this 3-page paper.  The most recent working   
   archived versions of those are:   
      
      
      
   and   
      
      
      
   Reading this again, it also turns out that the exact wording in the official   
   translation is:   
      
   | [...] we are led to the _more general_ conclusion:   
   |   The mass of a body is a measure of its energy content; [...]   
      
   Notice that, as has been pointed out, Einstein only means the "energy   
   content" *at relative rest*, i.e. the *rest* energy.   
      
   --   
   PointedEars   
      
   Twitter: @PointedEars2   
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