Einstein in 1904 or 1905, about the time he wrote the annus mirabilis papers
The annus mirabilis papers (from Latinannus mīrābilis, "miracle year") are the four[a] papers that Albert Einstein published in Annalen der Physik (Annals of Physics), a scientific journal, in 1905; 119 years ago (1905). These four papers were major contributions to the foundation of modern physics. They revolutionized science's understanding of the fundamental concepts of space, time, mass, and energy. Because Einstein published all four of these papers in a single year, 1905 is called his annus mirabilis (miracle year).
The first paper explained the photoelectric effect, which established the energy of the light quanta , and was the only specific discovery mentioned in the citation awarding Einstein the 1921 Nobel Prize in Physics.[2]
The fourth, a consequence of the theory of special relativity, developed the principle of mass–energy equivalence, expressed in the equation and which led to the discovery and use of atomic energy decades later.
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