Technologies

Major Energy Breakthrough: Milestone Achieved in US Fusion Experiment

For the first time, the National Ignition Facility officially achieved ignition in a fusion reactor.

It was touted as a «major scientific breakthrough» and, it seems, the rumors were true: On Tuesday, scientists at Lawrence Livermore National Laboratory announced that they have, for the first time, achieved net energy gain in a controlled fusion experiment.

«We have taken the first tentative steps toward a clean energy source that could revolutionize the world,» Jill Hruby, administrator of the National Nuclear Security Administration, said in a press conference Tuesday.

The triumph comes courtesy of the National Ignition Facility at LLNL in San Francisco. This facility has long tried to master nuclear fusion — a process that powers the sun and other stars — in an effort to harness the massive amounts of energy released during the reaction because, as Hruby points out, all that energy is «clean» energy.

Despite decades of effort, however, there had been a major kink in these fusion experiments: the amount of energy used to achieve fusion has far outweighed the energy coming out. As part of the NIF mission, scientists had long hoped to achieve «ignition,» where the energy output is «greater than or equal to laser drive energy.»

Some experts have remained skeptical that such a feat was even possible with fusion reactors currently in operation. But slowly, NIF pushed forward. In August last year, LLNL revealed it had come close to this threshold by generating around 1.3 megajoules (a measure of energy) against a laser drive using 1.9 megajoules.

But on Dec. 5, LLNL’s scientists say, they managed to cross the threshold.

They achieved ignition.

All in all, this achievement is cause for celebration. It’s the culmination of decades of scientific research and incremental progress. It’s a critical, albeit small, step forward, to demonstrate that this type of reactor can, in fact, generate energy.

«Reaching ignition in a controlled fusion experiment is an achievement that has come after more than 60 years of global research, development, engineering and experimentation,» Hruby said.

«It’s a scientific milestone,» Arati Prabhakar, policy director for the White House Office of Science and Technology, said during the conference, «but it’s also an engineering marvel.»

Still, a fully operational platform, connected to the grid and used to power homes and businesses, likely remains a few decades away.

«This is one igniting capsule at one time,» Kim Budil, director of LLNL, said. «To realize commercial fusion energy you have to do many things. You have to be able to produce many, many fusion ignition events per minute, and you have to have a robust system of drivers to enable that.»

So how did we get here? And what does the future hold for fusion energy?

Simulating stars

The underlying physics of nuclear fusion has been well understood for almost a century.

Fusion is a reaction between the nuclei of atoms that occurs under extreme conditions, like those present in stars. The sun, for instance, is about 75% hydrogen and, because of the all-encompassing heat and pressure at its core, these hydrogen atoms are squeezed together, fusing to form helium atoms.

If atoms had feelings, it would be easy to say they don’t particularly like being squished together. It takes a lot of energy to do so. Stars are fusion powerhouses; their gravity creates the perfect conditions for a self-sustaining fusion reaction and they keep burning until all their fuel — those atoms — are used up.

This idea forms the basis of fusion reactors.

Building a unit that can artificially re-create the conditions within the sun would allow for an extremely green source of energy. Fusion doesn’t directly produce greenhouse gases, like carbon dioxide and methane, which contribute to global warming.

And critically, a fusion reactor also doesn’t have the downsides of nuclear fission, the splitting of atoms used in nuclear bombs and reactors today.

In other words, a fusion power plant wouldn’t produce the radioactive waste associated with nuclear fission.

The big fusion experiment

The NIF, which takes up the space of around three football fields at LLNL, is the most powerful «inertial confinement fusion» experiment in the world.

In the center of the chamber lies a target: a «hohlraum,» or cylinder-shaped device that houses a tiny capsule. The capsule, about as big as a peppercorn, is filled with isotopes of hydrogen, deuterium and tritium, or D-T fuel, for short. The NIF focuses all 192 lasers at the target, creating extreme heat that produces plasma and kicks off an implosion. As a result, the D-T fuel is subject to extreme temperatures and pressures, fusing the hydrogen isotopes into helium — and a consequence of the reaction is a ton of extra energy and the release of neutrons.

You can think of this experiment as briefly simulating the conditions of a star.

The complicated part, though, is that the reaction also requires a ton of energy to start. Powering the entire laser system used by the NIF requires more than 400 megajoules — but only a small percentage actually hits the hohlraum with each firing of the beams. Previously, the NIF had been able to pretty consistently hit the target with around 2 megajoules from its lasers.

But on Dec. 5, during one run, something changed.

«Last week, for the first time, they designed this experiment so that the fusion fuel stayed hot enough, dense enough and round enough for long enough that it ignited,» Marv Adams, deputy administrator at the NNSA, said during the conference. «And it produced more energy than the lasers had deposited.»

More specifically, scientists at NIF kickstarted a fusion reaction using about 2 megajoules of energy to power the lasers and were able to get about 3 megajoules out. Based on the definition of ignition used by NIF, the benchmark has been passed during this one short pulse.

You might also see that energy gain in a fusion reaction is denoted by a variable, Q.

Like ignition, the Q value can refer to different things for different experiments. But here, it’s referring to the energy input from the lasers versus the energy output from the capsule. If Q = 1, scientists say they have achieved «breakeven,» where energy in equals energy out.

The Q value for this run, for context, was around 1.5.

In the grand scheme of things, the energy created with this Q value is only about enough to boil water in a kettle.

«The calculation of energy gain only considers the energy that hit the target, and not the [very large] energy consumption that goes into supporting the infrastructure,» said Patrick Burr, a nuclear engineer at the University of New South Wales.

The NIF is not the only facility chasing fusion — and inertial confinement is not the only way to kickstart the process. «The more common approach is magnetically confined fusion,» said Richard Garrett, senior advisor on strategic projects at the Australian Nuclear Science and Technology Organization. These reactors use magnetic fields to control the fusion reaction in a gas, typically in a giant, hollow donut reactor known as a tokamak.

Those devices have a much lower density than NIF’s pellets, so temperatures need to be increased to well over 100 million degrees. Garrett said he does not expect the NIF result to accelerate tokamak fusion programs because, fundamentally, the two processes work quite differently.

However, significant progress is also being made with magnetically confined fusion. For instance, the ITER experiment, under construction in France, uses a tokamak and is expected to begin testing in the next decade. It has lofty goals, aiming to achieve a Q greater than 10 and to develop commercial fusion by 2050.

The future of fusion

The experiment at NIF might be transformative for research, but it won’t immediately translate to a fusion energy revolution. This isn’t a power-generating experiment. It’s a proof of concept.

This is a point worth paying attention to today, especially as fusion has often been touted as a way to combat the climate crisis and reduce reliance on fossil fuels or as a salve for the world’s energy problems. Construction and utilization of fusion energy to power homes and businesses is still a ways off — decades, conservatively — and inherently reliant on technological improvements and investment in alternative energy sources.

Generating around 2.5 megajoules of energy when the total input from the laser system is well above 400 megajoules is, of course, not efficient. And in the case of the NIF experiment, it was one short pulse.

Looking further ahead, constant, reliable, long pulses will be required if this is to become sustainable enough to power kettles, homes or entire cities.

«It’s unlikely that fusion power … will save us from climate change,» said Ken Baldwin, a physicist at the Australian National University. If we are to prevent the largest increases in global average temperature, fusion power is likely going to be a little too late.

Other investment is going to come from private companies, which are seeking to operate tokamak fusion reactors in the next few years. For instance, Tokamak Energy in the UK is building a spherical tokamak reactor and seeks to hit breakeven by the middle of this decade.

Then there’s Commonwealth Fusion Systems, spun out of MIT, which is hoping to generate around 400 megawatts of power, enough for tens of thousands of homes, by the 2030s. Modern nuclear power plants can produce almost three times as much.

And as CNET editor Stephen Shankland noted in a recent piece, fusion reactors will also need to compete against solar and wind power — so even with today’s revelatory findings, fusion energy remains entrenched in the experimental phase of its existence.

But we can now cast one eye toward the future.

It may not prevent the worst of climate change but, harnessed to its full potential, it could produce a near-limitless supply of energy for generations to come. It’s one thing to think about the future of energy on Earth and how it will be utilized, but our eyes may fall on horizons even further out — deep space travel could utilize fusion reactors that blast us well beyond the reaches of our sun’s gravity, the very thing that helped teach us about fusion reactions, and into interstellar space.

Perhaps then, we’d remember Dec. 5, 2022, as the first tiny step toward places we dared once only dream about.

Correction, 8:44 a.m. PT: This article initially misstated the amount of energy in the fusion reaction. NIF powered the lasers with about 2 megajoules and produced 3 megajoules as a result.

Technologies

I’ve Seen It With My Own Eyes: The Robots Are Here and Walking Among Us

The «physical AI» boom has created a world of opportunity for robot makers, and they’re not holding back.

It’s been 24 years since CNET first published an article with the headline The robots are coming. It’s a phrase I’ve repeated in my own writing over the years — mostly in jest. But now in 2026, for the first time, I feel confident in declaring that the robots have finally arrived.

I kicked off this year, as I often do, wandering the halls of the Las Vegas Convention Center and its hotel-based outposts on the lookout for the technology set to define the next 12 months. CES has always been a hotbed of activity for robots, but more often than not, a robot that makes a flashy Vegas debut doesn’t go on to have a rich, meaningful career in the wider world.

In fact, as cute as they often are and as fun as they can be to interact with on the show floor, most robots I’ve seen at CES over the years amount to little more than gimmicks. They either come back year after year with no notable improvements or are never seen or heard from again.

In more than a decade of covering the show, I’ve been waiting for a shift to occur. In 2026, I finally witnessed it. From Hyundai unveiling the final product version of the Boston Dynamics Atlas humanoid robot in its press conference to Nvidia CEO Jensen Huang’s focus on «physical AI» during his keynote, a sea change was evident this year in how people were talking about robots.

«We’ve had this dream of having robots everywhere for decades and decades,» Rev Lebaredian, Nvidia’s vice president of Omniverse and simulation told me on the sidelines of the chipmaker’s vast exhibition at the glamorous Fontainebleau Hotel. «It’s been in sci-fi as long as we can remember.»

Throughout the show, I felt like I was watching that sci-fi vision come to life. Everywhere I went, I was stumbling upon robot demos (some of which will be entering the market this year) drawing crowds, like the people lining up outside Hyundai’s booth to see the new Atlas in action.

So what’s changed? Until now, «we didn’t have the technology to create the brain of a robot,» Lebaredian said.

AI has unlocked our ability to apply algorithms to language, and it’s being applied to the physical world, changing everything for robots and those who make them.

The physical AI revolution

What truly makes a robot a robot? Rewind to CES 2017: I spent my time at the show asking every robotics expert that question, sparked by the proliferation of autonomous vehicles, drones and intelligent smart home devices.

This exercise predated the emergence of generative AI and models such as OpenAI’s ChatGPT, but already I could see that by integrating voice assistants into their products, companies were beginning to blur the boundaries of what could be considered robotics.

Not only has the tech evolved since that time, but so has the language we use to talk about it. At CES 2026, the main topic of conversation seemed to be «physical AI.» It’s an umbrella term that can encompass everything from self-driving cars to robots.

«If you have any physical embodiments, where AI is not only used to perceive the environment, but actually to take decisions and actions that interact with the environment around it … then it’s physical AI,» Ahmed Sadek, head of physical AI and vice president of engineering at chipmaker Qualcomm told me.

Autonomous vehicles have been the easiest expression of physical AI to build so far, according to Lebaredian, simply because their main challenge is to dodge objects rather than interact with them. «Avoiding touching things is a lot easier than manipulating things,» he said.

Still, the development of self-driving vehicles has done much of the heavy lifting on the hardware, setting the stage for robot development to accelerate at a rapid pace now that the software required to build a brain is catching up.

For Nvidia, which worked on the new Atlas robot with Boston Dynamics, and Qualcomm, which announced its latest robotics platform at CES, these developments present a huge opportunity.

But that opportunity also extends to start-ups. Featured prominently at the CES 2026 booth of German automotive company Schaeffler was the year-and-a-half-old British company Humanoid, demonstrating the capabilities of its robot HMND 01.

The wheeled robot was built in just seven months Artem Sokolov, Humanoid’s CEO, told me, as we watch it sort car parts with its pincerlike hands. «We built our bipedal one for service and household much faster — in five months,» Sokolov added.

Humanoid’s speed can be accounted for by the AI boom plus an influx of talent recruited from top robotics companies, said Sokolov. The company has already signed around 25,000 preorders for HMND 01 and completed pilots with six Fortune 500 companies, he said.

This momentum extends to the next generation of Humanoid’s robots, where Sokolov doesn’t foresee any real bottlenecks. The main factors dictating the pace will be improvements in AI models and making the hardware more reliable and cost effective.

Humanoid hype hits its peak

Humanoid the company might have the rights to the name, but the concept of humanoids is a wider domain.

By the end of last year, the commercialization of humanoid robots had entered an «explosive phase of growth,» with a 508% year-on-year increase in global market revenue to $440 million, according to a report released by IDC this month.

At CES, Qualcomm’s robot demonstration showed how its latest platform could be adapted across different forms, including a robotic arm that could assemble a sandwich. But it was the humanoids at its booth that caused everyone to pull out their phones and start filming.

«Our vision is that if you have any embodiment, any mechatronic system, our platform should be able to transform it to a continuously learning intelligent robot,» said Qualcomm’s Sadek. But, he added, the major benefit of the humanoid form is its «flexibility.»

Some in the robotics world have criticized the focus on humanoids, due to their replication of our own limitations. It’s a notion that Lebaredian disagrees with, pointing out that we’ve designed our world around us and that robots need to be able to operate within it.

«There are many tasks that are dull, dangerous and dirty — they call it the three Ds — that are being done by humans today, that we have labor shortages for and that this technology can potentially go help us with,» he said.

We already have many specialist robots working in factories around the world, Lebaredian added. With their combination of arms, legs and mobility, humanoids are «largely a superset of all of the other kinds of robots» and, as such, are perfect for the more general-purpose work we need help with.

The hype around robots — and humanoids in particular — at CES this year felt intense. Even Boston Dynamics CEO Robert Playter acknowledged this in a Q&A with reporters moments after he unveiled the new Atlas on stage.

But it’s not just hype, Playter insisted, because Boston Dynamics is already demonstrating that they can put thousands of robots in the market. «That is not an indication of a hype cycle, but actually an indication of an emerging industry,» he said.

A huge amount of money is being poured into a rapidly growing number of robotics start-ups. The rate of this investment is a signal that the tech is ready to go, according to Nvidia’s Lebaredian.

«It’s because, fundamentally, the experts, people who understand this stuff, now believe, technically, it’s all possible,» he said. «We’ve switched from a scientific problem of discovery to an engineering problem.»

Robot evolution: From industry to home

From what I observed at the show, this engineering «problem» is one that many companies have already solved. Robots such as Atlas and HMND 01 have crossed the threshold from prototype to factory ready. The question for many of us will be as to when will these robots be ready for our homes.

Playter has openly talked about Boston Dynamics’ ambitions in this regard. He sees Atlas evolving into a home robot — but not yet. Some newer entrants to the robotics market — 1X, Sunday Robotics and Humanoid among them — are keen to get their robots into people’s homes in the next couple of years. Playter cautions against this approach.

«Companies are advertising that they want to go right to the home,» he said. «We think that’s the wrong strategy.»

The reasons he listed are twofold: pricing and safety. Playter echoed a sentiment I’ve heard elsewhere: that the first real use for home humanoid robots will be to carry out care duties for disabled and elderly populations. Perhaps in 20 years, you will have a robot carry you in and out of bed, but relying on one to do so when you’re in a vulnerable state poses «critical safety issue,» he said.

Putting robots in factories first allows people to work closely with them while keeping a safe distance, allowing those safety kinks to be ironed out. The deployment of robots at scale in industrial settings will also lead to mass manufacturing of components that will, at some point, make robots affordable for the rest of us, said Playter (unlike 1X’s $20,000 Neo robot, for example).

Still, he imagines the business model will be «robots as a service,» even when they do first enter our homes. Elder care itself is a big industry with real money being spent that could present Boston Dynamics with a market opportunity as Atlas takes its first steps beyond the factory floor.

«I spent a lot of money … with my mom in specialty care the last few years,» he said. «Having robots that can preserve autonomy and dignity at home, I think people will actually spend money — maybe $20K a year.»

The first «care» robots are more likely to be companion robots. This year at the CES, Tombot announced that its robotic labrador, Jennie, who first charmed me back at the show in 2020, is finally ready to go on sale. It served as yet another signal to me that the robots are ready to lead lives beyond the convention center walls.

Unlike in previous years, I left Vegas confident that I’ll be seeing more of this year’s cohort of CES robots in the future. Maybe not in my home just yet, but it’s time to prepare for a world in which robots will increasingly walk among us.

Technologies

Today’s Wordle Hints, Answer and Help for Jan. 29, #1685

Here are hints and the answer for today’s Wordle for Jan. 29, No. 1,685.

Looking for the most recent Wordle answer? Click here for today’s Wordle hints, as well as our daily answers and hints for The New York Times Mini Crossword, Connections, Connections: Sports Edition and Strands puzzles.

Today’s Wordle puzzle was a tough one for me. I never seem to guess three of the letters in this word. If you need a new starter word, check out our list of which letters show up the most in English words. If you need hints and the answer, read on.

Today’s Wordle hints

Before we show you today’s Wordle answer, we’ll give you some hints. If you don’t want a spoiler, look away now.

Wordle hint No. 1: Repeats

Today’s Wordle answer has no repeated letters.

Wordle hint No. 2: Vowels

Today’s Wordle answer has one vowel and one sometimes vowel.

Wordle hint No. 3: First letter

Today’s Wordle answer begins with F.

Wordle hint No. 4: Last letter

Today’s Wordle answer ends with Y.

Wordle hint No. 5: Meaning

Today’s Wordle answer can refer to a pastry that breaks apart easily.

TODAY’S WORDLE ANSWER

Today’s Wordle answer is FLAKY.

Yesterday’s Wordle answer

Yesterday’s Wordle answer, Jan. 28, No. 1684 was CRUEL.

Recent Wordle answers

Jan. 24, No. 1680: CLIFF

Jan. 25, No. 1681: STRUT

Jan. 26, No. 1682: FREAK

Jan. 27, No. 1683: DUSKY

Don’t miss any of our unbiased tech content and lab-based reviews. Add CNET as a preferred Google source.

Technologies

Today’s NYT Strands Hints, Answers and Help for Jan. 29 #697

Here are hints and answers for the NYT Strands puzzle for Jan. 29, No. 697.

Looking for the most recent Strands answer? Click here for our daily Strands hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle, Connections and Connections: Sports Edition puzzles.

Today’s NYT Strands puzzle is a bit of a puzzler until you realize the theme. Some of the answers are difficult to unscramble, so if you need hints and answers, read on.

I go into depth about the rules for Strands in this story.

If you’re looking for today’s Wordle, Connections and Mini Crossword answers, you can visit CNET’s NYT puzzle hints page.

Read more: NYT Connections Turns 1: These Are the 5 Toughest Puzzles So Far

Hint for today’s Strands puzzle

Today’s Strands theme is: Talk of the town.

If that doesn’t help you, here’s a clue: What a legend.

Clue words to unlock in-game hints

Your goal is to find hidden words that fit the puzzle’s theme. If you’re stuck, find any words you can. Every time you find three words of four letters or more, Strands will reveal one of the theme words. These are the words I used to get those hints but any words of four or more letters that you find will work:

ROIL, CLAIM, RARE, HELP, PEAR, PEARS, MORE, COIN, SPEAR, SPEARS

Answers for today’s Strands puzzle

These are the answers that tie into the theme. The goal of the puzzle is to find them all, including the spangram, a theme word that reaches from one side of the puzzle to the other. When you have all of them (I originally thought there were always eight but learned that the number can vary), every letter on the board will be used. Here are the nonspangram answers: