Drill deep and drill differently. That’s what’s needed to exploit the nearly bottomless promise of geothermal energy in the United States and around the globe, according to participants at the 2026 Spring Symposium, titled “Next-generation geothermal energy for firm power.” 

Sponsored by the MIT Energy Initiative (MITEI), the March 4 event drew 120 people, including MIT faculty and students, investors, and representatives from startups, multinational energy companies, and zero-carbon advocacy groups.

“The time feels right to pull together good policy, great corporate partners, and the research and technological innovations … to make significant advances in the widespread utilization of this incredible resource,” said Karen Knutson, the vice president for government affairs at MIT, in welcoming attendees.

Technology from the oil and gas industry helped usher in a first wave of geothermal energy. But chewing vertical holes through rocks in traditional ways can’t deliver on the full potential of this resource. And the real treasure — geologic formations radiating heat at 374 degrees Celsius and above — lies kilometers beneath Earth’s surface, far beyond the reach of most conventional drilling rigs.

Panelists explored the many innovations in accessing and circulating subsurface heat, as well as digging to unprecedented depths through extremely challenging geological conditions, discussing advanced drilling technologies, materials, and subsurface imaging.

This work is needed urgently, as demand for firm (always-on) power skyrockets in response to the electrification of industry and rise of data centers, said Pablo Dueñas‑Martínez, a MITEI research scientist. “We cannot get through this only with solar and wind; we need dense, deployable energy like geothermal.”

From “minuscule” to “almost inexhaustible” energy

In her opening remarks, Carolyn Ruppel, MITEI’s deputy director of science and technology, noted that despite decades of successful projects in places like the United States, Kenya, Iceland, Indonesia, and Turkey, geothermal still contributes only a “minuscule” share of global electricity. “The tremendous heat beneath our feet remains largely untouched,” she said.

Citing MIT’s milestone 2006 study “The Future of Geothermal Energy,” keynote speaker John McLennan, a professor at the University of Utah and co–principal investigator of the U.S. Department of Energy’s Utah FORGE enhanced geothermal systems (EGS) field laboratory, reminded attendees that the continental crust holds enough accessible heat to supply power for generations. “For practical purposes, it’s almost inexhaustible,” he said.

The question now, he said, is how to access that resource economically and responsibly.

At the Utah FORGE test site, McLennan has been part of a team investigating one method — adapting the oil and gas industry’s drilling and reservoir engineering expertise for hot, relatively impermeable rocks.

The project has drilled multiple deep wells into crystalline granitic rock, including a pair of wells that have been hydraulically stimulated and connected. In a recent circulation test, cold water was pumped down one well, flowed through fractures, and returned hot through the other.

“On a commercial basis … this hot water would be converted to electricity at the surface,” McLennan said. “This has now been demonstrated at Utah FORGE.”

The basic physics, in other words, work. The harder problems now are cost, repeatability, and scale.

Geothermal on the grid

Several panels highlighted the fact that next-generation geothermal is already beginning to deliver firm power.

At Lightning Dock, New Mexico, geothermal company Zanskar used a probabilistic modeling framework that simulated thousands of possible subsurface configurations to identify where to drill a new production well at an underperforming geothermal field. By thermal power delivered, the resulting well is now “the most-productive pumped geothermal well in the country,” said Joel Edwards, Zanskar’s co-founder and chief technology officer — powering the entire 15 megawatt (MW) Lightning Dock plant from a single well.

This data-driven approach enables the company to find and develop new resources faster and more cheaply than traditional methods, said Edwards.

José Bona, the director of next-generation geothermal at Turboden, explained how his company’s technology uses specialized turbines to circulate organic fluids that conserve heat better than water, and then convert that heat efficiently into electrical power. This closed-cycle technology can utilize low- to medium-temperature heat sources. Turboden is supplying its technology both to the Lightning Dock geothermal facility in New Mexcio and to Fervo Energy’s Cape Station in southwest Utah, an EGS project that will begin delivering 100 MW of baseload, clean electricity to the grid this year, aiming for 500 MW by 2028.

In Geretsried, Germany, Eavor has developed its own proprietary closed-loop system by creating a kind of underground radiator.

“We drilled to about 4.5 kilometers vertical depth, completed six horizontal multilateral pairs, and we delivered the first power to the grid in December,” said Christian Besoiu, the team lead of technology development at Eavor. The project will ultimately be capable of supplying 8.2 MW of electricity to the 32,000 households in the Bavarian town of Geretsried and 64 MW of thermal energy to the district in which the town lies, prioritizing heat when needed.

Beyond oil and gas technology

Early geothermal exploration typically targeted preexisting faults using vertical wells left by oil and gas drilling. Today, companies are experimenting with rock fracturing at multiple subsurface levels and creating heat reservoirs in previously untenable formations by using propping materials.

“Instead of vertical wells, we’re going to horizontal wells, we’re going to cased wells, we’re introducing proppants [solid materials that hold open hydraulically fractured rock] … we do dozens of stages with these designs,” said Koenraad Beckers, the geothermal engineering lead at ResFrac. This shale-style approach has already yielded much higher flow rates and more-reliable performance than earlier EGS.

Some current geothermal wells manage to achieve depths close to 15,000 feet using the oil and gas industry’s polycrystalline diamond compact drill bits, which can bore through hard rock like granite at more than 100 feet per hour. But these bits and the rigs that drive them are no match for conditions six or more kilometers down — and it is at those depths that the heat on hand begins to make an overwhelming economic case for geothermal.

“If we go to around 300 to 350 degrees, your power potential increases 10 times,” said Lev Ring, CEO of Sage Geosystems. “At that point, with reasonable CAPEX [capital expenditure] assumptions, levelized cost of electricity [a metric for comparing the cost of electricity across different generation technologies] is around 4 cents, and geothermal becomes cheaper than any other alternative.”

But “at 10 kilometers down … the largest land rigs in existence today cannot handle it,” Ring added. “We need alternatives — new materials, new ways to handle pressure, maybe even welding on the rig … a whole space that has not been addressed yet.”

One panel, featuring Quaise Energy, an MIT spinout with MITEI roots, spotlighted just how radically drilling might change. Co-founder Matt Houde described the company’s millimeter-wave drilling approach, which uses high-frequency electromagnetic waves derived from fusion research to vaporize rock instead of grinding it, as with conventional drilling. In a recent Texas field test, the team drilled 100 meters of hard basement rock in about a month, and is now planning kilometer-scale trials aimed at reaching superhot rock temperatures around 400 C, where each well could deliver many times the power of today’s geothermal projects.

Innovations for deep drilling

Moderating a panel on “MIT innovations for next-generation geothermal,” Andrew Inglis, the venture builder in residence with MIT Proto Ventures, whose position is sponsored by the U.S. Department of Energy GEODE program, framed the Institute’s role in getting such hard-tech ideas out of the lab and into the field. “The way MIT thinks about tech development, uniquely from other universities, can play a very singular role in geothermal commercial liftoff,” he said.

Materials researchers on that panel illustrated the point. Matěj Peč, an associate professor of geophysics in the Department of Earth, Atmospheric and Planetary Sciences, outlined work to build sensors that survive up to 900 C so that rock deformation and fracturing can be studied at supercritical conditions. Michael Short, the Class of 1941 Professor in the Department of Nuclear Science and Engineering, and C. Cem Tasan, the POSCO Associate Professor of Metallurgy in the Department of Materials Science and Engineering, respectively described coatings and alloys designed to resist corrosion, fouling, and cracking in extreme environments. In response to audience questions after their talks, Tasan made an important point, highlighting how academics need input from industry to understand the real-world problems (e.g., corrosion of pipes by geofluids) that require engineering solutions.

Other researchers are rethinking how to detect geothermal resources: Wanju Yuan, a research scientist with the Geological Survey of Canada at Natural Resources Canada, is using satellite imagery and thermal infrared sensing to screen vast regions for subtle hot spots and structures, processing thousands of images to identify promising sites in just a few months of work. “It’s a very efficient way to screen potential areas before more expensive exploration, thus reducing exploration and drilling risks,” he said.

Policy as backdrop, not center stage

Policy loomed in the background of many discussions — from bipartisan support for geothermal exploration and tax incentives to issues of regulation and permitting.

For Ruppel, that was by design.

“We wanted this meeting to showcase what’s technically possible and what’s already happening on the ground,” she said. “The policy world is starting to pay attention. Our job is to make sure that when that spotlight turns our way, next-generation geothermal is ready.”

MITEI’s Spring Symposium was followed by a gathering of geothermal entrepreneurs, investors, and energy industry experts co-hosted by MITEI and the Clean Air Task Force. “GeoTech Summit: Accelerating geothermal technology, projects, and deal flow” explored the financing challenges and opportunities of geothermal energy today.

The American Physical Society (APS) recently honored two MIT faculty members — professors Yoel Fink PhD ’00 and Mehran Kardar PhD ’83 — as well as six alumni with prizes and awards for their contributions to physics and academic leadership.

In addition, several MIT faculty members — Professor Jorn Dunkel, Professor Yen-Jie Lee PhD ’11, Associate Professor Mingda Li PhD ’15, and Associate Professor Julien Tailleur — as well as 12 additional alumni were named APS Fellows.

Yoel Fink PhD ’00, the Danae and Vasilis (1961) Salapatas Professor in the Department of Materials Science and Engineering, received the Andrei Sakharov Prize “for defending the academic freedom and human rights of scientists working in the U.S.”

The prize, named for physicist and human rights advocate Andrei Sakharov, recognizes scientists whose leadership and impact advance the principles of intellectual freedom and human dignity. Fink’s research focuses on “computing fabrics” — fibers and textiles that sense, communicate, store, and process information. By embedding functionality at the fiber level, fabrics become computing systems that can infer human activity and context while keeping the traditional qualities of garments. These textiles enable noninvasive monitoring of physiological and health conditions, with applications ranging from fetal and maternal health to human performance analytics, injury prevention in challenging environments, and defense.

Mehran Kardar PhD ’83, the Francis Friedman Professor of Physics, received the Lars Onsager Prize “for ground-breaking contributions to statistical physics, including the Kardar-Parisi-Zhang equation, Casimir forces, active matter, and aspects of biological physics.”

Kardar’s research focuses on how complex behavior emerges from simple interactions in systems both in and far from equilibrium, including stable ones like a still pond and rapidly changing ones such as growing surfaces. The Kardar-Parisi-Zhang equation, which he helped develop, provides a unifying framework for understanding how randomness and fluctuations shape evolving phenomena, from fluids and interfaces to biological and quantum systems. His work has also advanced the theoretical understanding of disordered materials, soft matter such as polymers and gels, and fluctuation-induced forces — including Casimir forces arising from quantum and thermal effects. More recently, he has applied these ideas to active matter — systems of self-driven units — and biological systems, helping reveal patterns in living and evolving systems.

Alumni receiving awards

Joel Butler PhD ’75 was presented the W.K.H. Panofsky Prize in Experimental Particle Physics “for wide-ranging scientific, technical, and strategic contributions to particle physics, particularly exceptional leadership in fixed-target quark flavor experiments at Fermilab and collider physics at the Large Hadron Collider.”

Anthony Duncan PhD ’75 is the recipient of the Abraham Pais Prize for History of Physics “for research on the history of quantum physics between 1900 and 1927 that culminated in 'Constructing Quantum Mechanics,' an exemplary work that uses primary sources masterfully and employs scaffold and arch metaphors to describe developments in the quantum revolution.”

Laura A. Lopez ’04 was presented the Edward A. Bouchet Award “for pioneering contributions to X-ray astronomy, including foundational studies of supernova remnants, compact objects, and stellar feedback in galaxies, and for transformative leadership in advancing equity and inclusion in physics through innovative mentorship programs, national advocacy, and unwavering support for students from historically marginalized communities.”

Zhiquan Sun PhD ’25 is the recipient of the J.J. and Noriko Sakurai Dissertation Award in Theoretical Particle Physics “for applying effective field theory to advance our understanding of QCD [quantum chromodynamics], including establishing a new formalism to study heavy quark fragmentation, determining how confinement affects energy correlators, and revealing an overlooked complexity of the axion solution to the strong CP [charge conjugation symmetry and parity symmetry] problem.”

Charles B. Thorn III ’68 received the Dannie Heineman Prize for Mathematical Physics for “fundamental contributions to elementary particle physics, primarily the theory of strong interactions and the development of string theory.”

Christina Wang ’19 received the Mitsuyoshi Tanaka Dissertation Award in Experimental Particle Physics “for pioneering a novel technique using CMS [Compact Muon Solenoid] muon chambers to search for weakly-coupled sub-GeV [giga-electronvolt] mass dark matter using long-lived particle searches, and for groundbreaking work in quantum sensing to enable new probes of dark matter.”

APS Fellows

Several MIT faculty were elected 2025 APS Fellows:

Jorn Dunkel, MathWorks Professor of Mathematics, is the recipient of the Division of Statistical and Nonlinear Physics Fellowship “for pioneering contributions to statistical, nonlinear, and biological physics, notably in understanding pattern formation in soft matter and biology, cell positioning in tissues, and turbulence in active media.”

Yen-Jie Lee PhD '11, professor of physics, received the Division of Nuclear Physics Fellowship “for pioneering measurements of jet quenching, medium response and heavy-quark diffusion in the quark-gluon plasma, and for using electron-positron collisions as an innovative control to understand collectivity in small collision systems.”

Mingda Li PhD '15, associate professor of nuclear science and engineering, is the recipient of the Topical Group on Data Science Fellowship “for pioneering the integration of artificial intelligence with scattering and spectroscopy, enabling breakthroughs in phonons, topological states, optical and time-resolved spectra, and data-driven discovery for quantum and energy applications.”

Julien Tailleur, associate professor of physics, is the recipient of the Division of Soft Matter Fellowship “for foundational theoretical work on motility-induced phase separation and emergent collective behavior in scalar active matter.”

The following additional MIT alumni were also honored as APS Fellows:

Andrew Cross SM ’05, PhD ’08 (EECS), Division of Quantum Information Fellowship 

Kevin D. Dorfman SM '01, PhD '02 (ChemE), Division of Polymer Physics Fellowship

Geoffroy Hautier PhD '11 (DMSE), Division of Computational Physics Fellowship

Douglas J. Jerolmack PhD '06 (EAPS), Division of Statistical and Nonlinear Physics Fellowship

Brian Lantz '92, PhD '99 (Physics), Division of Gravitational Physics Fellowship

Valerio Lucarini SM '03 (EAPS), Topical Group on Physics of Climate Fellowship

Giles Novak '81 (Physics), Division of Astrophysics Fellowship

Steve Presse PhD '08 (Physics), Division of Biological Physics Fellowship

Jonathan Rothstein PhD '01 (MechE), Division of Fluid Dynamics Fellowship

Gray Rybka PhD '07 (Physics), Division of Particles and Fields Fellowship

Sarah Sheldon '08, PhD '13 (Physics, NSE), Forum on Industrial and Applied Physics Fellowship

Lian Shen ScD '01 (MechE), Division of Fluid Dynamics Fellowship

It’s the second time the Senate Judiciary Committee declined to pass a version of the bill.

EFF calls on the Kuwaiti government to immediately release journalist Ahmed Shihab-Eldin. An award-winning journalist and television host who worked for Al Jazeera for many years, Shihab-Eldin—a dual American-Kuwaiti citizen—was arrested in Kuwait on March 3 while visiting family. The Committee to Protect Journalists (CPJ) reported yesterday that it is believed he has been charged with spreading false information, harming national security, and misusing his mobile phone.

According to the Guardian, Shihab-Eldin published footage of a U.S. Air Force F-15 E Strike Eagle crash, and posted to his Substack about the incident, noting that video circulating online showed local residents assisting the crash survivors. 

Kuwait is one of several countries that has recently cracked down on reporting amidst the ongoing war. Kuwait’s Ministry of Interior posted on X on March 3—the same day Shihab-Eldin was arrested—warning people in the country “not to photograph or publish any clips or information related to missiles or relevant locations.” Earlier this month, the UN Office of the High Commissioner for Human Rights (OHCHR) highlighted a new decree in Kuwait banning the circulation of reports that seek to “undermine the prestige of the military” or erode public trust in it. 

As reported by local media, the decree states that “those who intentionally publish statements or news or circulate false reports and rumors about military authorities resulting in weakening the trust in them and their morale, in addition to undermining their prestige, are punishable by three to 10 years in jail and a fine between KD 5,000 and 10,000.” The decree also imposes a penalty ranging from seven years to life imprisonment for “authorized people who cause financial loss or damage to the military authorities while carrying out a transaction, operation, project or case or obtaining any profit from such deals.”

In contrast to neighboring Gulf states, Kuwait has historically allowed the press to operate with relative freedom, and even introduced a law in 2020 protecting the right to access information. In practice, however, the government exercises considerable control over the media. Furthermore, there are several laws, including cybercrime legislation introduced in 2016, that restrict freedom of expression.

EFF is deeply concerned that Ahmed has not been seen nor heard from in nearly six weeks. We call on the government of Kuwait to immediately release Ahmed Shihab-Eldin. 

This is the fourth installment of a blog series reflecting on the global digital legacy of the 2011 Arab uprisings. You can read the rest of the series here.

Iran’s internet has been intermittently disrupted for months. After years of bombardment, Gaza’s telecommunications infrastructure remains fragile. In India, recurring shutdowns and throttling have become a routine response to protests and unrest, cutting millions off from news, work, and basic services. Across dozens of other countries, governments increasingly treat connectivity itself as something that can be weaponized—cut, slowed, or selectively restored to shape what people can see, say, and share. In 2024 alone, authorities imposed 304 internet shutdowns across 54 countries—the highest number ever recorded.

In 2011, when protesters in Tunisia, Egypt, and beyond used social media to broadcast their uprisings to the world, many observers heralded a new era of networked freedom. Governments, however, responded quickly by developing and refining systems of control that have only grown more sophisticated over time. Today’s landscape of regulation, blackouts, and degraded networks reflects that trajectory, as early experiments in censorship and disruption have hardened into a durable system of control—what began as an emergency measure has become a normalized infrastructure of control.

A Brief History of Internet Shutdowns

Egypt’s 2011 internet shutdown wasn’t the first. Although the government’s heavy-handed response after just two days of protests caught the world’s attention, Guinea, Nepal, Myanmar, and a handful of other countries had previously enacted shutdowns. But Egypt marked a turning point. In the years that followed, shutdowns increased sharply worldwide, suggesting that governments had taken note—adopting network disruptions as a tactic for suppressing dissent and limiting the flow of information within and beyond their borders.

On January 28, 2011, at 12:34 a.m. local time, five of Egypt’s internet service providers (ISPs) shut down their networks. At least one provider—Noor, which also hosted the Egyptian stock exchange—remained online, leaving only about 7% of the country connected. 

In the aftermath of President Hosni Mubarak’s resignation, rights groups sought to understand how such a sweeping shutdown had been possible—and how future incidents might be prevented. There was no centralized “kill switch.” Instead, authorities leveraged the country’s highly consolidated telecommunications sector, which all operate by government license. With only a handful of ISPs, a small number of directives was enough to bring most of the network offline.

In the years following Egypt’s 2011 shutdown, telecommunications companies—many of which had been directly implicated in enabling state-ordered disruptions—began to organize around a shared set of human rights challenges. Beginning that same year, a group of operators and vendors quietly convened to examine how the UN Guiding Principles on Business and Human Rights applied to their sector, particularly in contexts where government demands could translate into sweeping restrictions on access. By 2013, this effort had formalized into the Telecommunications Industry Dialogue, bringing together major global firms to develop common principles on freedom of expression and privacy and, through a partnership with the Global Network Initiative, engage more directly with civil society. The initiative reflected a growing recognition that telecom companies—unlike platforms—operate at a critical chokepoint in the network. But it also underscored the limits of voluntary approaches: while the Dialogue helped establish shared norms, it did little to constrain the legal and political pressures that continue to drive shutdowns—or to prevent companies from complying with them.

From Emergency Measure to Legal Authority

If the early aughts were defined by improvised shutdowns, the years since have seen governments formalize their power to control networks. What was once exceptional is now often embedded in law.

In India, the 2017 Temporary Suspension of Telecom Services Rules—issued under the Telegraph Act—provided a clear legal pathway for cutting connectivity. The Telecommunications Act, 2023, further entrenched the government’s ability to enact shutdowns, granting the central and state governments, or “authorised officers” the power to suspend telecommunications services in the interest of public safety or sovereignty, or during emergencies. The government has used these measures repeatedly, particularly in Jammu and Kashmir. India’s Software Freedom Law Centre’s Shutdown Tracker shows India as instigating more than 900 shutdowns, 447 of which were in Jammu and Kashmir.

In Kazakhstan, shutdowns have also become common. Over the years, the government has passed legislation that allows state agencies to shut down the internet. The 2012 law on national security enabled the government to disrupt communications channels during anti-terrorist operations and to contain riots. In 2014 and 2016, laws were further amended to expand the number of actors able to shut down the internet without a court decision, and a government decree in 2018 enabled shutdowns in the event of a “social emergency.” 

Elsewhere, governments have built or expanded legal and technical frameworks that enable similar control over information flows. Ethiopia’s state-dominated telecom sector has facilitated sweeping shutdowns during periods of conflict, including the war in Tigray, where the internet was disconnected for more than two years. In Iran, authorities have developed regulatory and infrastructural capacity to isolate domestic networks from the global internet, allowing them to restrict external visibility while maintaining limited internal connectivity. This year alone, Iranians have spent one third of the year offline. And amidst the ongoing war, Iranian officials have made it clear that the internet is a privilege for those who toe the government’s official line.

Even where laws do not explicitly authorize shutdowns, broadly worded provisions around national security or public order are routinely used to justify them. The result is a growing legal architecture that treats network disruptions not as extraordinary measures, but as standard tools for managing populations.

When that authority is exercised over a population beyond a state’s own citizens, the consequences can be even more severe. Israel’s Ministry of Communications controls the flow of communications in and out of Palestine and has used that power to shut down internet access during periods of conflict. Over the past two and a half years, Gaza has experienced repeated outages, and experts now estimate that roughly 75% of its telecommunications infrastructure has been damaged—leaving essential services severely disrupted.

Elections and the Expansion of Control

Historically, most blackouts have occurred during moments of intense political tension. But authorities are increasingly using them as a tool to preempt dissent.

In 2024, as more than half the world’s population headed to the polls, shutdowns followed. That year alone, authorities imposed 304 internet shutdowns across 54 countries—the highest number ever recorded, surpassing the previous record set just a year earlier. The geographic spread also widened significantly, with shutdowns affecting more countries than ever before. The Comoros imposed a shutdown for the first time, while other countries, such as Mauritius, instituted broad bans on social media platforms during elections.

At least 24 countries holding elections in 2024 had a prior history of shutdowns, putting billions of people at risk of disruptions during critical democratic moments.

What stands out is not just the scale, but the normalization. Notably, the number of shutdowns in 2025 broke the record set the year prior. Whereas network disruptions were once a rare occurrence, they are now a routine measure, increasingly treated by authorities as a standard response to periods of heightened political sensitivity. 

Civil Society Fights Back

Governments use all sorts of justifications—national security, curbing the spread of disinformation, and even preventing students from cheating on exams—for internet shutdowns. But civil society is watching, and documenting, network disruptions and their impact on citizens.

In 2016, as shutdowns became an increasingly common tool of state control, Access Now launched the #KeepItOn campaign to coordinate global advocacy against network disruptions. The campaign includes a coalition composed of 345 advocacy groups (including EFF), research centers, detection networks, and others who work together to report on, and fight back against, internet shutdowns. Anyone can get involved by signing on to campaign action alerts, sharing their story, or reporting a shutdown in their jurisdiction.

Ending this harmful practice remains the goal. In 2016, the UN passed a landmark resolution supporting human rights online and condemning internet shutdowns, and UN agencies have continued to warn against the practice. But the fight to change government practices remains an uphill battle, leading civil society—and even companies—to get creative. 

During repeated shutdowns in Gaza, grassroots efforts mobilised to distribute eSIMs so Palestinians could stay connected. In 2024, EFF recognized Connecting Humanity, a Cairo-based non-profit providing eSIM access in Gaza, with its annual award for its vital work. Satellite internet such as Starlink has been supplied to people in Ukraine and Iran, though it, too, is not immune to state control. Alongside these efforts, civil society continues to share practical guidance on circumventing shutdowns and maintaining access to information.

EFF’s mission is to ensure that technology supports freedom, justice, and innovation for all people of the world—and we’ll continue to fight back against internet shutdowns wherever they occur.

This is the fourth installment of a blog series reflecting on the global digital legacy of the 2011 Arab uprisings. Read the rest of the series here.

This article on the walls of Constantinople is fascinating.

The system comprised four defensive lines arranged in formidable layers:

• The brick-lined ditch, divided by bulkheads and often flooded, 15­-20 meters wide and up to 7 meters deep.
• A low breastwork, about 2 meters high, enabling defenders to fire freely from behind.
• The outer wall, 8 meters tall and 2.8 meters thick, with 82 projecting towers.
• The main wall—a towering 12 meters high and 5 meters thick—with 96 massive towers offset from those of the outer wall for maximum coverage.

...

Climate change and the energy transition are driving a wave of state laws overriding local governments, with both parties driving their preferred policies.

Municipalities in the U.S. territory have asked a federal appeals court to revive their first-in-the-nation racketeering case against the oil and gas industry.

The Health Action Alliance launched its Extreme Weather + Work initiative Wednesday with 11 member companies.

The revisions highlight a growing divide among Democrats over gas prices and climate policy.

EPA's endangerment finding was an unlawful use of legislative authority reserved to Congress, the senators argue in a court brief.

The chief sustainability officer said the company may recalibrate its approach to reducing its carbon footprint.

The Atlanta-based carrier deleted its pledge to use sustainable aviation fuel for 10 percent of its jet fuel by 2030.

A “green divide” is growing between richer and poorer Europeans, a new study finds.

A 2025 report by aid group Mercy Corps warned that Kabul faces "an unprecedented humanitarian disaster within the coming decade."

Nature Climate Change, Published online: 15 April 2026; doi:10.1038/s41558-026-02617-w

Optimal climate change mitigation pathways have historically focused on achieving emissions reductions while ensuring cost efficiency. However, the broader impacts of climate action are also important for policymakers and stakeholders. We developed a method that enables mitigation pathways to be defined based on their impact on multiple United Nations Sustainable Development Goals (SDGs).

Nature Climate Change, Published online: 15 April 2026; doi:10.1038/s41558-026-02599-9

This work shows that increased eddies accelerate surface warming in the Agulhas Current while also boosting hidden upwelling that cools the current, and adjacent shelf seas, at depth. Similar trends are expected for all subtropical western boundary currents, even if volume transports remain steady.

A special class of sensors leverages quantum properties to measure tiny signals at levels that would be impossible using classical sensors alone. Such quantum sensors are currently being used to study the inner workings of cells and the outer depths of our universe.

Particularly promising are solid-state quantum sensors, which can operate at room temperature. Unfortunately, most solid-state quantum sensors today only measure one physical quantity at a time — such as the magnetic field, temperature, or strain in a material. Trying to measure both the magnetic field and temperature of a material at the same time causes their signals to get mixed up and measurements to become unreliable.

Now, MIT researchers have created a way to simultaneously measure multiple physical quantities with a solid-state quantum sensor. They achieved this by exploiting entanglement, where particles become correlated into a single quantum state. In a new paper, the team demonstrated its approach in a commonly used quantum sensor at room temperature, measuring the amplitude, frequency, and phase of a microwave field in a single measurement. They also showed the approach works better than sequentially measuring each property or using traditional sensors.

The researchers say the approach could enable quantum sensors that can deepen our understanding of the behavior of atoms and electrons inside materials and living systems like cancer cells.

“Quantum multiparameter estimation has been mostly theoretical to date,” says co-lead author of the paper Takuya Isogawa, a graduate student in nuclear science and engineering. “There have been very few experiments that actually demonstrate it, and that work focused on photons. We wanted to demonstrate multiparameter estimation in a more application-oriented setup: a solid-state quantum sensor in use today.”

Joining Isogawa on the paper are co-lead authors Guoqing Wang PhD ’23 and MIT PhD candidate Boning Li. The other authors on the paper are former MIT visiting students Zhiyao Hu and Ayumi Kanamoto; University of Tokyo PhD candidate Shunsuke Nishimura; Chinese University of Hong Kong Professor Haidong Yuan; and Paola Cappellaro, MIT’s Ford Professor of Engineering, a professor of nuclear science and engineering and of physics, and a member of the Research Laboratory of Electronics.

Quantum effects for measurement

Quantum sensors exploit quantum effects like entanglement, spin states, and superposition to measure changes in magnetic fields, electric fields, gravity, acceleration, and more. As such, they can be used to measure the activity of single molecules in ways that are useful for understanding biology and space, like tracking the activity of metabolites or enzymes inside cells.

One particularly useful sensor in biology leverages what’s known as nitrogen-vacancy (NV) centers in diamonds, a defect where a carbon atom in the diamond’s crystal lattice is replaced by a nitrogen atom, and a neighboring lattice site is missing, or vacant. The defect hosts an electronic spin whose transition frequencies can be read out optically. The NV center’s spin state is extremely sensitive to external effects, such as magnetic fields and temperature, which can shift the spin state in ways that can be measured at extremely high resolution.

Unfortunately, different external effects change the energy resonances of the spin in similar ways, making it difficult to measure multiple effects at once. The result is that most solid-state quantum sensor applications measure a single physical quantity at one time.

“If you can only measure one quantity at a time, you have to repeat experiments to measure quantities one by one,” Isogawa says. “That takes more time, which means less sensitivity. It also makes experiments more susceptible to errors.”

For their experiment, the researchers used NV centers inside of a 5-square-millimeter diamond. They pointed a laser into the diamond and studied its fluorescence to make their measurements, a common approach for such sensors. To study the electronic spin of the NV center, they used a microwave antenna. To study the spin of the nitrogen atom they used a radio frequency field.

“We used those two spins as two qubits,” Isogawa says, referring to the building blocks of quantum computing systems. “If you have only one qubit, you can only measure one outcome: basically, 0 or 1. It’s the probability that it spins up or down. Think of it like a coin toss, with the probability of getting heads or tails. With two qubits, we increased the parameters that we could extract.”

The system worked because the spins of the sensor qubit and auxiliary qubit were entangled, a quantum property where the state of one particle is dependent on another. With one qubit, you get a binary outcome. With two, you get four possible outcomes with a total of three possible parameters.

The two qubits allowed researchers to measure those three quantities simultaneously using a technique known as the Bell state measurement.

Other researchers had used the Bell state measurement at extremely low temperatures before, but the MIT researchers developed a new technique to perform the measurement at room temperature. That technique was first proposed by Wang, who was previously a graduate student in Professor Cappellaro’s lab.

The researchers used the approach to simultaneously measure the amplitude, detuning, and phase of a microwave magnetic field. The researchers also say the approach could be used to measure electric fields, temperature, pressure, and strain.

“Measuring these parameters simultaneously can help us explore spin waves in materials, which is an important topic in condensed matter physics,” Isogawa says. “NV center sensors have extremely high spatial resolution and versatility. It can measure a lot of different physical quantities.”

More practical quantum sensing

The researchers say this work is an important step toward using solid-state quantum sensors to more fully characterize systems in biomedical research and materials characterization. That’s because multiparameter estimation had never been achieved in realistic settings or in widely used quantum sensors.

“What makes the NV center quantum sensors so special is they can operate at room temperature,” Isogawa says. “It’s very suitable for biological measurements or condensed matter physics experiments.”

Although the researchers say their sensor didn’t measure each quantity at the highest possible precision, in future work they plan to explore if their approach can achieve higher precision for each parameter.

They also plan to explore how their approach works to characterize heterogenous materials.

“In an extremely uniform environment, you could use many different classical and quantum sensors and measure each physical quantity at the same time,” Isogawa says. “But if the physical quantities change at different locations, you need high spatial sensors, and you need a sensor that can measure multiple physical quantities. This approach has major advantages in such situations.”

The work was supported, in part, by the U.S. National Science Foundation, the National Research Foundation of Korea, and the Research Grants Council of Hong Kong.

In September 2024, Amandla Thomas-Johnson was a Ph.D. candidate studying in the U.S. on a student visa when he briefly attended a pro-Palestinian protest. In April 2025, Immigration and Customs Enforcement (ICE) sent Google an administrative subpoena requesting his data. The next month, Google gave Thomas-Johnson's information to ICE without giving him the chance to challenge the subpoena, breaking a nearly decade-long promise to notify users before handing their data to law enforcement. 

Today, the Electronic Frontier Foundation sent complaints to the California and New York Attorneys General asking them to investigate Google for deceptive trade practices for breaking that promise. You can read about the complaints here. Below is Thomas-Johnson's account of his ordeal. 

Out of touch but not out of reach 

I thought my ordeal with U.S. immigration authorities was over a year ago, when I left the country, crossing into Canada at Niagara Falls.  

By that point, the Trump administration had effectively turned federal power against international students like me. After I attended a pro-Palestine protest at Cornell University—for all of five minutes—the administration’s rhetoric about cracking down on students protesting what we saw as genocide forced me into hiding for three months. Federal agents came to my home looking for me. A friend was detained at an airport in Tampa and interrogated about my whereabouts. 

I’m currently a Ph.D. student. Before that, I was a reporter. I’m a dual British and Trinadad and Tobago citizen. I have not been accused of any crime. 

I believed that once I left U.S. territory, I had also left the reach of its authorities. I was wrong. 

The email

Weeks later, in Geneva, Switzerland, I received what looked like a routine email from Google. It informed me that the company had already handed over my account data to the Department of Homeland Security. 

At first, I wasn’t alarmed. I had seen something similar before. An associate of mine, Momodou Taal, had received advance notice from Google and Facebook that his data had been requested. He was given advanced notice of the subpoenas, and law enforcement eventually withdrew them before the companies turned over his data. 

Google had already disclosed my data without telling me.

I assumed I would be given the same opportunity. But the language in my email was different. It was final: “Google has received and responded to legal process from a law enforcement authority compelling the release of information related to your Google Account.” 

Google had already disclosed my data without telling me. There was no opportunity to contest it. 

Google’s broken promise

To be clear, this should not have happened this way. Google promises that it will notify users before their data is handed over in response to legal processes, including administrative subpoenas. That notice is meant to provide a chance to challenge the request. In my case, that safeguard was bypassed. My data was handed over without warning—at the request of an administration targeting students engaged in protected political speech. 

Months later, my lawyer at the Electronic Frontier Foundation obtained the subpoena itself. On paper, the request focused largely on subscriber information: IP addresses, physical address, other identifiers, and session times and durations. 

But taken together, these fragments form something far more powerful—a detailed surveillance profile. IP logs can be used to approximate location. Physical addresses show where you sleep. Session times would show when you were communicating with friends or family. Even without message content, the picture that emerges is intimate and invasive.  

State power meets private data

What this experience has made clear is that anyone can be targeted by law enforcement. And with their massive stores of data, technology companies can facilitate those arbitrary investigations. Together, they can combine state power, corporate data, and algorithmic inference in ways that are difficult to see—and even harder to challenge. 

The consequences of what happened to me are not abstract. I left the United States. But I do not feel that I have left its reach. Being investigated by the federal government is intimidating. Questions run through your head. Am I now a marked individual? Will I face heightened scrutiny if I continue my reporting? Can I travel safely to see family in the Caribbean? 

Who, exactly, can I hold accountable?

This is a current list of where and when I am scheduled to speak:

• I’m speaking at DemocracyXChange 2026 in Toronto, Ontario, Canada, on April 18, 2026.
• I’m speaking at the SANS AI Cybersecurity Summit 2026 in Arlington, Virginia, USA, at 9:40 AM ET on April 20, 2026.
• I’m speaking at the Nemertes [Next] Virtual Conference Spring 2026, a virtual event, on April 29, 2026.
• I’m speaking at RightsCon 2026 in Lusaka, Zambia, on May 6 and 7, 2026.
• I’m giving a keynote address and participating in a panel discussion at an ICTLuxembourg event called “...