Daily briefing: Physics Nobel for founder of neutrino-hunting observatory

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Physics Nobel for neutrino hunter

Physicist Francis Halzen has won the 2026 Nobel Prize in Physics for his work in founding the IceCube Neutrino Observatory and for the discovery of high-energy neutrinos that come from deep in space. More than 1 billion neutrinos pass through your hand every second, but they are hard to detect because they are unaffected by magnetic fields and rarely ever interact with matter. IceCube detects once-in-a-blue-moon interactions between atoms and neutrinos that have been emitted by cosmic events such as supernovae and γ-ray bursts. “This reflects on the really courageous people who joined me in this project”, Halzen said, “when really no respectable conservative physicist would have joined me.”

After decades of planning and construction, “there was no guarantee we would ever see anything”, said Halzen. But it took only two years for the collaboration to detect particles from outside our Solar System, establishing the new field of neutrino astronomy.

Nature | 9 min read

Reference: Science paper (from 2013)

Sleepless nights on distant ice

Francis Halzen’s essay ‘Antarctic Dreams’, about IceCube’s precursor, the Antarctic Muon And Neutrino Detector Array, was featured in The Best American Science Writing 2000. In it, he says that, as a “superfluous theorist”, he has never made the journey to see his project in person. “But even now, on the nights when drilling goes on there, I can never sleep,” he writes. “To have your career on the line half a world away is hard enough. But to know that you have embroiled so many others in the same improbable adventure, that your funders and colleagues expect results, and that you are totally powerless to affect the outcome, is a form of exquisite torture.”

Exploratorium archive | 20 min read

Neutrinos could change everything

Neutrinos are cool — that’s the first reason I’m so excited about this Nobel. When the Nobel committee made its announcement, several physics folk in our team grinned at each other. And I’d go so far as to put my money on neutrinos being the thing that finally breaks open the standard model of particle physics. The simplest version of the model says that neutrinos have no mass, but experiments show they do — we just don’t know exactly what it is. Or whether they are their own antiparticles, or if they have something to do with the great mystery of why there’s more matter than antimatter. IceCube’s purpose isn’t to study neutrinos themselves, but it has revealed more about them — such as how they interact with matter. Understanding neutrinos could mean understanding the Universe — whether that’s through IceCube’s successor, or one of the many other experiments racing to probe this particle du jour.

Lizzie Gibney, Nature reporter

Notable quotable

“Theorists write two kinds of papers. One kind to explore the physics they really believe in, and another kind just to show how smart they are. And my initial neutrino papers were certainly in the second category. I had never any intention of ending up doing this, but then things got out of hand.”

Francis Halzen says that being “naive and ignorant” when he started working on the proposal for IceCube helped him to succeed, because he didn’t know all the ways that it could fail. (Jot Down | 28 min read, from 2014, free registration required)

News

Flu season jumps the gun

Flu season might have come earlier than expected in the Northern Hemisphere, with the percentage of positive influenza tests in places such as the United Kingdom and west coast of the United States unusually high for this time of year. “An early start doesn’t necessarily mean a more severe season,” says epidemiologist James Hay. But it could prompt a rethink of when people should get their annual vaccines. Specialists are also concerned that the subtype responsible for most US cases so far, H1N1, is carrying a mutation that could help it to evade some people’s immunity.

Nature | 7 min read

Franklin knew what she was doing

A new analysis of notes made by X-ray crystallographer Rosalind Franklin further debunks the myth that she failed to grasp the significance of the data she herself generated. In his autobiography, biologist James Watson wrote that an image Franklin produced — known as Photograph 51 — triggered his ‘eureka’ moment about the helical structure of DNA. But Franklin had in fact already recognized and analysed the helical structure in an earlier image: Photograph 49. “She reused the same DNA sample for Photograph 51 to create a better-centred but otherwise identical diffraction image that would be suitable for publication,” write science historian Alistair Sponsel and crystallographer Brian Sutton.

Science | 8 min read

Reference: Journal of the History of Biology paper

Features & opinion

Smart glasses are privacy nightmare

The rapid rollout of AI-powered wearables, such as smart glasses with cameras, could expose millions of people to non-consensual surveillance at an unprecedented scale, argues AI ethicist Joy Buolamwini. Policymakers must act now to update regulatory frameworks before this technology becomes ubiquitous, Buolamwini writes. This should include the introduction of spaces, such as schools and hospitals, in which covert recording is illegal.

Nature | 5 min read

Make the hidden flows of vital data visible

A universal accounting system is needed to track how global supply chains could be disrupted by energy, data and computation failures, argues climate-change economist Dabo Guan. For example, in 2025, a fire at a single electricity substation — caused by an issue that had been spotted in 2018 — shut London Heathrow Airport, cancelling around 1,300 flights and disrupting travel for more than 200,000 passengers. “No accounting framework linked the substation to the airport and the supply chains downstream; the dependency became visible only when it failed,” Guan writes.

Nature | 10 min read

Protein synthesis, no cell required

A technique called cell-free protein expression is helping synthetic biologists to design and manufacture scores of potentially useful proteins without the need to tinker with and grow microorganisms. The method enables researchers to produce proteins that would be toxic to living cells or get chewed up by a cell’s enzymes. The tech’s flexibility shortens the design–build–test–learn cycle from days or weeks to hours, says synthetic biologist Wilson Wong.

Nature | 11 min read

Today I’m celebrating a new candidate for the world’s loudest bird — the bare-throated bellbird (Procnias nudicollis). Males flaunt their wares with a 130-decibel mating call, louder than a jackhammer.

Let me know your favourite bird calls — or least-favourite loud sounds, plus any feedback on this newsletter, at briefing@nature.com.

Thanks for reading,

Flora Graham, chief editor, Nature Briefing

With contributions by Jacob Smith

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