Changes

* According to Einstein, a body losing energy through heat or [[radiation]] was losing mass.<ref>Multiple references:

* According to Einstein, a body losing energy through heat or [[radiation]] was losing mass.<ref>Multiple references:

*Einstein, Albert (September 27, 1905).  [http://web.archive.org/web/20081217082511/http://www.physik.uni-augsburg.de/annalen/history/papers/1905_18_639-641.pdf "Ist die Trägheit eines Körpers von dessen Energieinhalt abhängig?"], ''Annalen der Physik'', vol. 18, pp. 639–643.  Retrieved from December 17, 2008 Internet Archive archive of University of Augsburg/Annalen der Physik website on January 31, 2015.

*Einstein, Albert (September 27, 1905).  [http://web.archive.org/web/20081217082511/http://www.physik.uni-augsburg.de/annalen/history/papers/1905_18_639-641.pdf "Ist die Trägheit eines Körpers von dessen Energieinhalt abhängig?"], ''Annalen der Physik'', vol. 18, pp. 639–643.  Retrieved from December 17, 2008 Internet Archive archive of University of Augsburg/Annalen der Physik website on January 31, 2015.

*English translation:  Einstein, Albert (September 27, 1905).  [http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ "Does the inertia of a body depend on its energy-content?"].  Translated in Perrett, Wilfrid and Jeffery, George B. (1923), ''The Principle of Relativity'' (London: Methuen), pp. 67-71.  Retrieved from Fourmilab [Switzerland] website on January 31, 2015.</ref>

*English translation:  Einstein, Albert (September 27, 1905).  [http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ Hypertext of "Does the inertia of a body depend on its energy-content?"].  Translated in Perrett, Wilfrid and Jeffery, George B. (1923), ''The Principle of Relativity'' (London: Methuen), pp. 67-71.  Hypertext retrieved from Fourmilab [Switzerland] website on January 31, 2015.</ref>

* Einstein did not originate the idea of using non-Euclidean geometry<ref>His friend Paul Ehrenfest pointed out the need for curved space. [http://www.britannica.com/EBchecked/topic/181349/Albert-Einstein]</ref> [[metric tensor]]s to reconcile gravity with special relativity.<ref>[http://www.univ-nancy2.fr/DepPhilo/walter/papers/b4.pdf]</ref> It was not his idea to describe gravity in [[covariant equations]], and he published papers supposedly showing that it was impossible.<ref>[http://www.pitt.edu/~jdnorton/papers/decades_re-set.pdf]</ref> He did not discover the Lagrangian formulation of [[general relativity]], and was not the first to publish the field equations. He did not foresee the [[expansion of the universe]] (although this expansion is consistent with the field equations), the possibility of black holes, or [[dark energy]].

* Einstein did not originate the idea of using non-Euclidean geometry<ref>His friend Paul Ehrenfest pointed out the need for curved space. [http://www.britannica.com/EBchecked/topic/181349/Albert-Einstein]</ref> [[metric tensor]]s to reconcile gravity with special relativity.<ref>[http://www.univ-nancy2.fr/DepPhilo/walter/papers/b4.pdf]</ref> It was not his idea to describe gravity in [[covariant equations]], and he published papers supposedly showing that it was impossible.<ref>[http://www.pitt.edu/~jdnorton/papers/decades_re-set.pdf]</ref> He did not discover the Lagrangian formulation of [[general relativity]], and was not the first to publish the field equations. He did not foresee the [[expansion of the universe]] (although this expansion is consistent with the field equations), the possibility of black holes, or [[dark energy]].