November 21, 1905 - Albert Einstein unveils his famous formula

Between March and September 1905, the German scientific journal "Annales der Physik" mailbox received four studies that would forever change the laws of physics and, ultimately, the conception of the reality of light, matter, time, and space.

The author was a 26-year-old Albert Einstein who, at the time, was working at the patent office in Berne (Switzerland). His career as a physicist had stalled after the rejection of his doctoral thesis, and his scientific passion had been relegated to his spare time and long idle hours in the office. However, this year was a miraculous one for Einstein with these four significant studies.

On 21 November the last of the four studies was published with the question: "Does the inertia of a body depend on the energy it contains?". It is an epilogue to all the other studies in which the mathematical demonstration of specific relativity, and thus the proof of the equivalence between matter and energy, was condensed into the most famous formula in history: E = mc².