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→Reasons to restore the version of Feb 10, 2010: @Andrew Schlafly: you are joking, aren't you?
::::<math>\Delta m = \frac{\Delta E}{c^2}</math>
::::<math>\Delta m = \frac{\Delta E}{c^2}</math>
::::which states only that a system's mass will change by a small amount when it releases or absorbs energy. It's still E=mc<sup>2</sup>; the difference is the definition of m and E. For example, it describes the rather difficult-to-ignore fact that a <sup>4</sup>He nucleus weighs less than the two deuterons from which it was formed. This concept is easier to prove than the more general statement of mass-energy equivalence. [[User:Spielman|Spielman]] 13:06, 11 February 2013 (EST)
::::which states only that a system's mass will change by a small amount when it releases or absorbs energy. It's still E=mc<sup>2</sup>; the difference is the definition of m and E. For example, it describes the rather difficult-to-ignore fact that a <sup>4</sup>He nucleus weighs less than the two deuterons from which it was formed. This concept is easier to prove than the more general statement of mass-energy equivalence. [[User:Spielman|Spielman]] 13:06, 11 February 2013 (EST)
:::::''Is there even a single accomplished physicist who claims that E=mc2 is true, and explains why?'' - Andrew Schlafly, you could start with Richard Feynman's ''Lectures on Physics'', Book 1, 15-9 "''Equivalence of mass and energy''", which closes with the words
{{cquote|''This theory of equivalence of mass and energy has been beautifully verified by experiments in which matter is annihilated - converted totally to energy: An electron and a positron come together at rest, each with a rest mass <math>m_0</math>. When they come together they disintegrate and two gamma rays emerge, each with the measured energy of <math>m_0c^2</math>. This experiment furnishes a direct determination of the energy associated with the existence of the rest mass of a particle''|||Richard Feynman}}
:::::But you can take any textbook covering the special theory of relativity... --[[User:AugustO|AugustO]] 13:43, 11 February 2013 (EST)