1921

Nobel Prize in Physics

Albert Einstein

The prize was held over from 1921 and placed in Einstein's hands the following year — not for relativity, which the committee found philosophically alarming, but for the photoelectric effect: the quiet proof that light arrives in packets, not waves. It was, by any measure, an understatement.

Nobel Prize in Chemistry

Frederick Soddy

Soddy had worked out that the same element could come in different atomic weights — not impurities, not errors, but genuinely different versions of the same thing. He called them isotopes, which is Greek for "same place," because they sit in exactly the same box on the periodic table. The prize, also held from 1921, followed in 1922.

Nobel Prize in Literature

Anatole France

The committee cited his nobility of style, his humanity, his grace, and what they called a true Gallic temperament — a phrase that manages to be both a compliment and an entire national caricature simultaneously. France accepted with characteristic irony.

Nobel Peace Prize

Karl Hjalmar Branting · Christian Lous Lange

Branting had spent his career navigating Swedish Social Democracy toward the League of Nations; Lange had spent his as secretary-general of the Inter-Parliamentary Union, which is less glamorous but considerably more patient work. The committee split the prize between them as if internationalism were best administered in two doses.

Isolation of insulin at the University of Toronto

On 30 July, Frederick Banting and Charles Best extracted a hormone from a dog's pancreas and watched the animal's diabetic symptoms reverse. James Collip then purified the extract sufficiently for human use, and by January 1922 a fourteen-year-old boy in a Toronto ward, near death from diabetes, had been brought back.

Kaluza proposes five-dimensional unification of gravity and electromagnetism

Theodor Kaluza sent Einstein a paper suggesting that if you add a fifth dimension to general relativity, Maxwell's equations fall out as a bonus. Einstein sat on it for two years before presenting it to the Prussian Academy, apparently needing time to decide whether the idea was brilliant or absurd. It was both.

Emmy Noether publishes ideal theory in rings

Noether's paper in Mathematische Annalen established that a single condition — the ascending chain condition on ideals — is enough to guarantee the orderly factorisation of algebraic structures. Rings satisfying that condition now carry her name, a small but permanent monument in a field that had long done its best to ignore her.

Chadwick and Bieler identify anomalous proton scattering — first evidence of the strong force

Alpha particles fired at hydrogen were bouncing back at angles that Coulomb's law flatly could not account for. Chadwick and Biéler concluded, with careful understatement, that something powerful and non-electrical must be operating at very short ranges inside the nucleus — a force that had no name yet, but was already making itself felt.

McCollum identifies vitamin D and its role in preventing rickets

Elmer McCollum showed that cod liver oil contained something distinct from vitamin A — a fourth vitamin, which he called D — that cured rickets in rats. Its eventual addition to milk would quietly straighten the bones of a generation of children who never knew to be grateful.

Thomas Midgley discovers tetraethyllead as an anti-knock additive

On 9 December, Thomas Midgley Jr. demonstrated at General Motors that a small dose of tetraethyllead silenced the knocking in petrol engines. It worked magnificently. Leaded fuel dominated for fifty years before the slow accumulation of evidence about lead in human blood — and particularly in children's blood — rendered it a monument to the gap between solving one problem and noticing what else you have done.

First BCG tuberculosis vaccination administered

On 18 July, a newborn infant in Paris became the first person to receive the BCG vaccine, developed by Albert Calmette and Camille Guérin at the Pasteur Institute after thirteen years of work on attenuated Mycobacterium. The infant survived; the vaccine went on to become one of the most widely administered in history.

Death of Henrietta Swan Leavitt

Henrietta Swan Leavitt

Leavitt died on 12 December, at fifty-three. Her 1912 discovery that Cepheid variable stars pulse with a period directly tied to their brightness gave astronomers a ruler long enough to measure the cosmos — the very ruler Edwin Hubble would use, within three years, to discover that the Milky Way is not, in fact, the whole story.

Birth of Yoichiro Nambu

Yoichiro Nambu

Born on 18 January in Tokyo, Nambu would later become the physicist who noticed that nature has a preference for breaking its own symmetries spontaneously — a concept so fundamental that it underlies the Higgs mechanism, the quark model, and the Nobel Prize in Physics he received in 2008, at the age of eighty-seven.