query: $E=mc^2$ what is unique about the speed of light?
positive_passages.docid: 14036
positive_passages.text: What is so special about speed of light in vacuum?
negative_passages.docid: 139987
negative_passages.text: Special Relativity, 2nd Postulate -- Why?
negative_passages.docid: 17754
negative_passages.text: Intuitive Understanding of the constant "$e$"
negative_passages.docid: 120679
negative_passages.text: Rømer's determination of the speed of light
negative_passages.docid: 115572
negative_passages.text: Theoretical proof of the constant of speed of light $c$ in vacuum in all frames of references
negative_passages.docid: 152686
negative_passages.text: How to derive $E=mc^{2}$?
negative_passages.docid: 77731
negative_passages.text: 'size' of a photon
negative_passages.docid: 7618
negative_passages.text: What is the speed of light relative to?
negative_passages.docid: 3909
negative_passages.text: Does $E = mc^2$ apply to photons?
negative_passages.docid: 38865
negative_passages.text: How can a Photon have a "frequency"?
negative_passages.docid: 12422
negative_passages.text: Derivation of $E=pc$ for a massless particle?
negative_passages.docid: 12597
negative_passages.text: Does the speed of medium affect the path of light?
negative_passages.docid: 112965
negative_passages.text: Are virtual particles limited by the speed of light?
negative_passages.docid: 58775
negative_passages.text: What exactly does the *frequency* of a photon mean?
negative_passages.docid: 104844
negative_passages.text: Why is gravity such a unique force?
negative_passages.docid: 61714
negative_passages.text: Can One-Way Speed of Light be Instantaneous?
negative_passages.docid: 19850
negative_passages.text: Why is the speed of light defined as 299792458 m/s?