🇩🇪🇺🇸Albert
Einstein

At age sixteen, Albert Einstein posed himself a question that would take him ten years to answer: what would the world look like if you could ride alongside a beam of light? In Newtonian physics — the framework that had described reality for two hundred years — the answer seemed straightforward: the light wave would appear frozen, standing still beside you, its oscillations stopped. But Einstein sensed immediately that this picture was wrong, that it violated something deep in the structure of Maxwell's equations governing electromagnetism. The question lodged in his mind and refused to let go. Most sixteen-year-olds wonder about girls or football. Einstein wondered about the nature of time.

He was born on March 14, 1879, in Ulm, in the Kingdom of Württemberg in the German Empire, the first child of Hermann and Pauline Einstein, a secular Jewish family of middling means. He was slow to speak — his parents were concerned enough to consult a doctor — but once he started, he was relentlessly curious. At five, his father gave him a magnetic compass, and the invisible force that kept the needle pointing north seized his imagination so completely that he recalled the experience decades later as one of the formative moments of his childhood. At twelve, he discovered algebra and Euclidean geometry, teaching himself from a school booklet he called his "sacred little geometry book." By fifteen he had mastered differential and integral calculus on his own. He was not a prodigy in the conventional sense — he did not perform brilliantly in school competitions or win prizes. He was something different: a sustained, autonomous, almost compulsive thinker.

He failed the entrance exam to the Swiss Federal Polytechnic in Zurich on his first attempt in 1895, at sixteen — he was two years younger than most applicants and his French was weak. He spent a year at a school in Aarau, Switzerland, which used a progressive Pestalozzi teaching method emphasizing visualization and conceptual understanding rather than rote memorization. It was here that he first formulated the light-beam thought experiment. The following year he passed the Polytechnic exam and enrolled to study physics. He graduated in 1900, but failed to secure an academic position; no professor would recommend him. He took a job as a patent examiner, third class, at the Swiss Federal Office for Intellectual Property in Bern.

The patent office, it turned out, suited him. The work required quick, precise mechanical reasoning, left his mind free in the afternoons and evenings, and brought him into contact with the very latest technological innovations passing through the intellectual economy. In 1905 — his "annus mirabilis," his miraculous year — Einstein published four papers in the journal Annalen der Physik that collectively transformed physics more thoroughly than any single year's work since Newton's plague years of 1665–66. The first explained Brownian motion, providing decisive evidence that atoms are real. The second explained the photoelectric effect by proposing that light is quantized into discrete packets — photons — work for which he would eventually receive the Nobel Prize. The third introduced the special theory of relativity, demonstrating that the speed of light is the same for all observers regardless of their motion, that time passes at different rates for observers moving relative to each other, and that simultaneity is not absolute. The fourth derived E=mc² from the principles of special relativity. He was twenty-six. He was still employed as a patent examiner.

The physics community took a few years to absorb what had happened, but by 1909 Einstein had a professorship in Zurich, and by 1914 he was a member of the Prussian Academy of Sciences in Berlin — the most prestigious scientific position in Germany. He spent the next several years extending his theory. Special relativity handled physics at constant velocities; Einstein now wanted to include acceleration and gravity. In November 1915, he presented the general theory of relativity to the Prussian Academy: a framework in which gravity is not a force but a curvature of spacetime caused by mass and energy. The theory predicted that light would bend around massive objects, that time would run slower in gravitational fields, and that the universe was dynamic rather than static. In 1919, a British expedition led by Arthur Eddington observed the bending of starlight during a solar eclipse, confirming Einstein's prediction precisely. The result made front pages around the world. Einstein became, almost overnight, the most famous scientist alive.

When the Nazis came to power in Germany in 1933, Einstein — who was visiting the United States — did not return. His property was confiscated, his citizenship revoked, his books burned. He accepted a position at the newly founded Institute for Advanced Study in Princeton, New Jersey, where he spent the remaining twenty-two years of his life. He worked, with limited success, on a unified field theory. He quarreled productively with Niels Bohr about the interpretation of quantum mechanics, arguing famously that "God does not play dice with the universe." In 1939, at the urging of fellow physicists, he signed a letter to President Roosevelt warning that Germany might be developing atomic weapons, which contributed to the establishment of the Manhattan Project — a project whose results Einstein later described as his greatest regret. He died on April 18, 1955, in Princeton, of an abdominal aortic aneurysm. He refused surgery, telling his doctors: "I want to go when I want. It is tasteless to prolong life artificially." He was seventy-six. The general theory of relativity predicted black holes, gravitational waves, and the expanding universe — all confirmed only decades after his death.