1905 is probably the best-known year in physics, since it was the year of the discovery of the special theory of relativity. For decades, historiography has told us that Albert Einstein, then a patent examiner in Bern, succeeded in developing this theory on his own, overcoming all the difficulties that the greatest scientists of his time had not been able to solve. However, some have pointed out that, before Einstein’s first publication in this field, the French mathematician and physicist Henri Poincaré had obtained the same results, which he had published several months before...