In the Einstein cult thesis and antithesis harmoniously coexist (doublethink). Einsteinians believe that the mass-energy equivalence formula E=mc² was gloriously derived by Einstein in 1905 and at the same time they admit that the formula has nothing to do with Einstein's relativity:

Brian Koberlein: "This led Henri Poincaré to propose non-electromagnetic stresses to hold the electron together. When he calculated the energy of these stresses, he found it amounted to a fourth of an electron's total mass. Thus, the "actual" mass of the electron due to its electric charge alone must be m=E/c². Poincaré's paper deriving this result was published in June of 1905, just a few months before Einstein's paper. Although the equation is often attributed to Einstein's 1905 paper, Einstein didn't actually derive the equation from his theory of relativity." https://www.forbes.com/sites/briankoberlein/2017/11/09/the-history-of-einsteins-most-famous-equation/

Hans C. Ohanian: "Although Einstein's name is closely linked with the celebrated relation E=mc² between mass and energy, a critical examination of the more than half dozen "proofs" of this relation that Einstein produced over a span of forty years reveals that all these proofs suffer from mistakes. Einstein introduced unjustified assumptions, committed fatal errors in logic, or adopted low-speed, restrictive approximations. He never succeeded in producing a valid general proof applicable to a realistic system with arbitrarily large internal speeds." https://arxiv.org/ftp/arxiv/papers/0805/0805.1400.pdf

Philip Ball: "The biggest revelation for me was not so much seeing that there were several well-founded precursors for the equivalence of mass and energy, but finding that this equivalence seems to have virtually nothing to do with special relativity. Tony Rothman said to me that "I've long maintained that the conventional history of science, as presented in the media, textbooks and by the stories scientists tell themselves is basically a collection of fairy tales." I'd concur with that." http://philipball.blogspot.com/2011/08/did-einstein-discover-emc2.html

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"The concepts of time (spacetime) in quantum theory and GR are thus drastically different and cannot both be fundamentally true." http://hindawi.com/journals/isrn/2013/509316/

So what? In post-truth science lie and truth harmoniously coexist, "with the lie always one leap ahead of the truth":

George Orwell: "Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them. The Party intellectual knows…that he is playing tricks with reality; but by the exercise of doublethink he also satisfies himself that reality is not violated. The process has to be conscious, or it would not be carried out with sufficient precision, but it also has to be unconscious, or it would bring with it a feeling of falsity and hence of guilt…the essential act of the Party is to use conscious deception while retaining the firmness of purpose that goes with complete honesty. To tell deliberate lies while genuinely believing in them, to forget any fact that has become inconvenient, and then, when it becomes necessary again, to draw it back from oblivion for just so long as it is needed, to deny the existence of objective reality and all the while to take account of the reality which one denies - all this is indispensably necessary…one is tampering with reality; by a fresh act of doublethink one erases this knowledge ; and so on indefinitely, with the lie always one leap ahead of the truth."

Theoreticians reconcile Newton's absolute time and Einstein's relative time (in Big Brother's world theoreticians reconcile 2+2=4 and 2+2=5):

Natalie Wolchover: "The effort to unify quantum mechanics and general relativity means reconciling totally different notions of time. In quantum mechanics, time is universal and absolute; its steady ticks dictate the evolving entanglements between particles. But in general relativity (Albert Einstein's theory of gravity), time is relative and dynamical, a dimension that's inextricably interwoven with directions X, Y and Z into a four-dimensional "space-time" fabric." https://www.quantamagazine.org/20161201-quantum-gravitys-time-problem/

Perimeter Institute: "Quantum mechanics has one thing, time, which is absolute. But general relativity tells us that space and time are both dynamical so there is a big contradiction there. So the question is, can quantum gravity be formulated in a context where quantum mechanics still has absolute time?" https://www.perimeterinstitute.ca/research/conferences/convergence/roundtable-discussion-questions/what-are-lessons-quantum

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