1928

Nobel Prize in Physics

Electrons Boiling Off a Hot Wire

Owen Willans Richardson

At the turn of the century, physicists had noticed that a heated metal filament released charged particles into the surrounding vacuum, but why and how much were questions that resisted any clean account. Owen Richardson worked out the answer with unusual care: he derived the mathematical law governing how the emission current rises with temperature, a relationship now known as the Richardson-Dushman equation, and tied it to the emerging theory of electron behaviour inside metals. It was painstaking, unglamorous work — not a single dramatic discovery but a slow accumulation of measurement and theory arriving at something exact. The prize came in 1928, more than a decade after the foundational papers. The practical consequences were rather large: every vacuum tube in every radio receiver and early television set depended on this precise, quantified understanding of electrons boiling off a hot wire. Without it, broadcasting is just guesswork and glowing.

Nobel Prize in Chemistry

Sunlight, Turned Into Chemistry

Adolf Windaus

Adolf Windaus arrived at the chemistry of sterols the long way, spending the better part of two decades picking apart the molecular architecture of cholesterol and its relatives — the waxy ring-structured alcohols that appeared, somewhat mysteriously, in practically every biological membrane and tissue one cared to examine. The structural chemistry was formidably difficult, the molecules large and complicated, and the tools available before the age of X-ray crystallography were blunt. What Windaus eventually established was the connection between the sterol skeleton and the fat-soluble vitamins, and specifically that ergosterol, exposed to ultraviolet light, transforms into vitamin D. This was not just elegant biochemistry: it explained, at last, why children who never saw the sun developed rickets, and why cod liver oil worked, and it pointed toward a simple, cheap prevention for a disease that had bent the limbs of the poor for centuries. The sun, it turned out, was doing chemistry the whole time.

Nobel Prize in Physiology or Medicine

The Louse That Carried Typhus

Charles Nicolle

Working at the Institut Pasteur in Tunis in the early years of the century, Charles Nicolle was attempting to understand typhus — a disease that had toppled armies, devastated civilian populations during famines and wars, and remained almost entirely mysterious as to how it moved from person to person. The clue was hiding in plain sight, if you happened to notice that typhus-infected patients stopped transmitting the disease precisely when they entered the hospital — stripped, bathed, and dressed in fresh gowns. Nicolle noticed. He concluded that the contagion must travel on ordinary clothing and skin surface, and the only plausible candidate was the body louse. Later experimental work confirmed it entirely. Nicolle himself described the moment of insight as occurring on the steps of the hospital, which may be the most productively inconvenient eureka in the history of epidemiology. Understanding the louse as vector transformed typhus from an act of fate into a practical problem of hygiene — one that could, at least in principle, be managed.

Nobel Prize in Literature

A Woman's Whole Life, in Winter Light

Sigrid Undset

Sigrid Undset published her three-volume Kristin Lavransdatter between 1920 and 1922, setting a sprawling portrait of a Norwegian woman's entire life against the backdrop of fourteenth-century Scandinavia — its Catholic faith, its feudal codes, its particular northern light and winter darkness. The Swedish Academy cited her for a powerful description of northern life during the Middle Ages, which is technically accurate and rather undersells the thing. What Undset actually produced is a novel about what it costs a woman to want her own life in a world that has very precise ideas about what women's lives should contain: desire, stubbornness, guilt, consequence, and finally a hard-won quiet. She converted to Catholicism shortly after finishing it, which surprised some readers and perhaps explained much of the trilogy in retrospect. Kristin remains something rarer than a historical novel — it is a moral novel that happens to be set in the past, and the questions it asks have not dated.

Alexander Fleming discovers penicillin

A Ruined Plate, Not Thrown Away

Alexander Fleming returned from his summer holiday on 3 September 1928 to find a culture plate he had left sitting on the bench now hosting an uninvited Penicillium mould — and around the mould, a clear zone where every staphylococcus colony had dissolved. Most bench scientists, confronted with a ruined experiment, would have binned the plate and started again. Fleming binned nothing; he examined the zone of inhibition, isolated what he called 'mould juice,' confirmed it killed a range of harmful bacteria without apparent toxicity to animals, and published in 1929. He recognised what he had found and could not make it work: the unstable extract proved impossible to purify with the chemistry available to him, and for more than a decade penicillin remained a curiosity. It took Howard Florey and Ernst Chain in Oxford — and ultimately the industrial mobilisation of the United States during the Second World War — to turn that summer plate into an injectable drug. The mould did the discovery; Fleming did the noticing; a continent at war did the manufacturing. Between them, they saved a number of lives that is genuinely difficult to put in a sentence.

Dirac formulates the relativistic quantum equation

An Equation That Predicted Antimatter

By 1927, quantum mechanics could describe the electron in exquisite probabilistic detail, and special relativity could describe anything moving near the speed of light — but the two theories refused, stubbornly, to speak the same language. Paul Dirac, then twenty-five and working in Cambridge, published his solution in January 1928: a single equation that married both formalisms into one, elegant and compact in a way that deeply satisfied him on aesthetic grounds. The equation was generous beyond his expectations. It predicted the electron's spin, which quantum theory had simply postulated without explanation, as a natural mathematical consequence. And buried in its algebra was something stranger: solutions corresponding to a particle identical to the electron in every respect except that its electric charge was positive. Dirac initially tried to explain this away as the proton. Carl Anderson found the actual particle — the positron, the first piece of antimatter — in a cloud chamber in 1932. Dirac had written antimatter into existence four years before anyone saw it, which is either the finest advertisement for mathematical physics or a rather sobering comment on how much reality hides in equations.

First successful clinical tests of penicillin begin

Discovered, Then Unusable for a Decade

The weeks following Fleming's September observation saw some initial testing of the crude mould extract — smeared onto infected surfaces, dripped onto bacterial cultures — that demonstrated clear antibacterial effect, though the substance proved so impure and so unstable at body temperature that it dissolved before reaching a systemic infection. Fleming published in 1929 and continued occasional efforts to purify it, without success; the compound was chemically fickle, and the biochemical toolkit of the late 1920s was simply not equal to it. This is the unglamorous middle chapter of penicillin's story that tends to get skipped in popular accounts: a genuine discovery sitting in print for more than a decade, visited occasionally by those who read the paper, not yet usable by anyone who needed it. The path from that contaminated plate to the mass-produced antibiotic that turned bacterial pneumonia from a common cause of death into a usually manageable nuisance ran through Oxford, through Florey and Chain, through wartime American pharmaceutical plants, and through rather a lot of patience.