  What, if any, was Einstein's biggest mistake, the one most affecting our
physics today? There is a perhaps apocryphal story, recounted by George Gamow,
that he counted his cosmological constant as his biggest blunder. We now know
his hypothesized cosmological constant to be correct. His lifelong rejection of
quantum mechanics, an interesting side-story in the evolution of 20th-century
physics, is a candidate. None of these introduced difficulties in how our
physics is done today. It can be argued that his biggest actual mistake, one
that affects many subfields of physics and chemistry and bewilders students
today, occurred in his naming of his A and B coefficients.
