1968

Nobel Prize in Physics

A Catalogue for the Particle Zoo

Luis Alvarez

By the mid-1950s, particle physicists were finding themselves in an awkward position: the more powerful their accelerators became, the more strange and short-lived particles emerged from the collisions, accumulating faster than anyone could make sense of them. Alvarez's contribution was to build the tools that made systematic sense possible — enormous liquid-hydrogen bubble chambers, the largest reaching nearly two metres, in which the tracks of subatomic debris could be photographed, measured, and catalogued with industrial thoroughness. The resulting zoo of hadron resonances — particles lasting billionths of a nanosecond before dissolving into something else — was bewildering in the era before quarks, and became foundational the moment the quark model arrived to explain why there were so many of them. Alvarez's committee was unusually prescient: without that catalogue, the quark model would have had nothing solid to explain. He later turned the same empirical instinct toward geology, proposing with his son Walter that the iridium-rich layer at the Cretaceous boundary was the signature of an asteroid impact — a claim initially mocked, now orthodoxy.

Nobel Prize in Chemistry

Thirty-Seven Years to Notice a Symmetry

Lars Onsager

In 1931, Lars Onsager — a Norwegian-born chemist working at Yale with a reputation for being nearly incomprehensible in seminars — published two short papers deriving what became known as the reciprocal relations: the observation that when you write out the matrix of coefficients linking thermodynamic flows to their driving forces (heat to temperature gradient, electrical current to voltage, one diffusing species to another), that matrix is symmetric. The result was not obviously exciting, but its consequences ran deep, providing the first rigorous theoretical backbone for the entire field of irreversible thermodynamics — the science of systems that are not quite at equilibrium, which is to say most systems that actually exist. The chemistry committee required 37 years to reach this conclusion, a delay so remarkable that Onsager had long since moved on to other contributions, including an exact solution to the two-dimensional Ising model that physicists still use as a benchmark. One hopes the wait did not feel as long to him as it does in retrospect.

Nobel Prize in Physiology or Medicine

Reading Life's Alphabet for the First Time

Robert W. Holley · H. Gobind Khorana · Marshall W. Nirenberg

For three billion years, every living cell on Earth has been reading the same instruction manual — a four-letter alphabet arranged in three-letter codons, specifying which amino acid to add next to a growing protein chain — without any of its authors having the slightest idea the manual existed. Nirenberg cracked the first codon in 1961 using an inspired trick: synthetic RNA made of a single repeating nucleotide, fed into a cell-free system to see what protein it produced. Khorana then synthesised RNA sequences of defined, repeating structure to work through the ambiguous cases, and by 1966 all 64 codons had been assigned. Holley completed the picture by actually sequencing a transfer RNA molecule — the physical adapter that reads a codon and delivers the corresponding amino acid — showing the machinery in atomic detail. The three men had, between them, not just described biology but decoded it, which is a meaningfully different thing. Every drug designed to disrupt protein synthesis, every genetic therapy, every PCR test taken during a pandemic, depends on understanding a code that is now read as fluently as any alphabet.

Nobel Prize in Literature

Melancholy That Accumulates Like Snow

Yasunari Kawabata

Kawabata grew up in a succession of losses — father, mother, grandparents — and the shadow of that solitude never quite left his prose, which is perhaps why it reads so often as beautiful and slightly bereft at the same time. Trained in classical Japanese literature and drawn to the compression of haiku, he developed a style that Western readers encountered through the novels Snow Country, The Sound of the Mountain, and The Old Capital: spare, imagistic, built as much around ellipsis and silence as around statement, with a melancholy that accumulates like snow rather than arriving as announcement. The Swedish Academy, citing his narrative mastery in expressing the essence of the Japanese mind, was reaching, as Swedish academies will, but in this case they were not wrong about what they had found. He was the first Japanese writer to receive the prize, and his acceptance speech — drawing on Zen poetry, on the beauty of impermanence — remains one of the quieter, stranger Nobel lectures on record. The work endures not because it offers comfort but because it refuses to pretend that comfort is the only thing worth offering.

Nobel Peace Prize

An Authority Quieter Than an Army

René Cassin

René Cassin arrived at the newly formed United Nations Human Rights Commission in 1947 as a French jurist, a veteran of the First World War, a survivor — his extended family had been largely destroyed by the Holocaust — and a man with a specific technical task: to turn a loose set of aspirations about human dignity into text that could be formally adopted by a fractious international body. The Universal Declaration of Human Rights, which the UN General Assembly adopted in December 1948 with 48 votes in favour and eight abstentions, was the result. It is not a treaty; it carries no enforcement mechanism; no court can compel compliance with it in its own name. It has also been cited in courtrooms on every continent, quoted by dissidents from prison cells, and invoked in constitutions written long after its drafting — which is a peculiar kind of authority, quieter and more durable than the kind that requires an army. Cassin later founded the International Institute of Human Rights in Strasbourg and lived to see his declaration become, whatever its practical limitations, the common reference point for what the minimum owed to a human being is supposed to look like.

ACM A.M. Turing Award

A Message That Fixes Its Own Errors

ACM A.M. Turing Award

Richard W. Hamming

In the early days of electronic computing, errors were a fact of life: vacuum tubes failed, cosmic rays flipped bits, storage media were unreliable, and the standard remedy was simply to run a calculation twice and hope the answers matched. Hamming, working at Bell Labs in the late 1940s, found this unsatisfying, and in 1950 published the solution: a class of error-correcting codes in which a small number of redundant check bits are woven through a message in such a way that any single-bit error can not only be detected but located and corrected automatically, without retransmission. The geometry of the idea — each valid codeword separated from its neighbours by a minimum Hamming distance — turned out to be the seed of an entire field, coding theory, whose descendants now protect every satellite link, hard drive, QR code, and wireless transmission in use. He is, appropriately, also remembered for a 1986 lecture called "You and Your Research," in which he argued with characteristic bluntness that the main thing separating scientists who do important work from those who do competent work is the willingness to actually work on important problems, a point so obvious that almost everyone ignores it.

Apollo 8: first crewed orbit of the Moon

Earth Seen Whole, and Alone

The original plan for Apollo 8 was a test of the lunar module in Earth orbit; there was no lunar module ready in time, so NASA made the audacious decision to send the crew all the way to the Moon instead, on a timeline compressed by intelligence reports suggesting the Soviets were close to doing it first. On 21 December 1968, Frank Borman, James Lovell, and William Anders lifted off, crossed the 385,000 kilometres to lunar orbit in three days, and spent Christmas Eve completing ten loops over the far side, reading from Genesis on a live broadcast to an Earth audience estimated at a billion people. William Anders, glancing out the window during the fourth orbit, saw the Earth hanging above the grey lunar surface and grabbed a colour camera to photograph it — a small, blue, cloud-swirled sphere suspended in absolute black, with no borders visible anywhere on its surface. The photograph, known as Earthrise, did something that decades of environmental rhetoric had not quite managed: it made the planet look finite, and fragile, and very much alone. The crew returned safely on 27 December. The image has been in continuous circulation since.

Intel Corporation founded

A Two-Page Plan for Shrinking Everything

Robert Noyce and Gordon Moore had already done something remarkable at Fairchild Semiconductor — Noyce co-invented the integrated circuit, and Moore articulated in 1965 the empirical observation that transistor density on a chip doubles roughly every two years, a rule that would quietly govern the entire computing industry for the next half-century. In July 1968 they left Fairchild, raised money with a two-page business plan that relied almost entirely on their reputations, and incorporated NM Electronics, swiftly renamed Intel. Their first products were memory chips; their third, the 4004 microprocessor released in 1971, put a general-purpose computing engine on a single piece of silicon. The consequences were not immediately obvious — Intel's early business remained in memory — but the microprocessor eventually rendered obsolete entire categories of specialised hardware and reorganised the computing industry around a single, replicable, perpetually shrinking component. Moore's Law became a self-fulfilling prophecy: manufacturers invested to meet the prediction, which ensured the prediction came true. It is now slowing, which is the most significant thing that has happened in computing in decades.

Death of George Gamow

Right First, Rewarded Never

George Gamow

George Gamow was the sort of physicist who made other physicists feel vaguely inadequate and occasionally bewildered: he contributed substantially to nuclear physics, to the quantum theory of alpha decay, to the structure of DNA, and to cosmology, all while writing popular science books of genuine wit and producing illustrations that his colleagues found either charming or distracting depending on their temperament. In 1948, with Ralph Alpher and Robert Herman, he predicted that if the early universe had been hot and dense enough to forge the light elements, the thermal radiation from that fireball should still permeate space as a faint microwave glow — cooled by the expansion of the universe to a few degrees above absolute zero. In 1964, Arno Penzias and Robert Wilson detected exactly that signal with an antenna in New Jersey, initially mistaking it for pigeon droppings and then, realising it came uniformly from every direction in the sky, for the cosmos itself. They received the Nobel Prize in Physics in 1978. Gamow, who had been right first, died on 19 August 1968 in Boulder, Colorado, aged 64, without one. The Nobel is not awarded posthumously, and the committee's record on this particular prediction is not its finest.