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A comment on Physicists believe they can create matter from colliding photons. Parent comment

Re:Physicists believe they can create matter from colliding ... by eternauta3k on Saturday December 26, 2015 @12:21PM (#10794583)
The c² is not central, you can work in a set of units such that the equation is E²=m²+p². If you decide to add a unit for mass, then you naturally need a conversion factor with units of speed.
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Re:Physicists believe they can create matter from colliding ... by 1ris on Saturday December 26, 2015 @02:21PM (#10794923)
This is the first part of the Explanation. It is indeed E²=m²+p², but the p is the _relativistic_ impulse. For practical proposes you usually want the classical impulse p_0 in this equitation. And is a way easier to see how c shows up in the conversion between these two.
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