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This startup wants to build a fusion reactor — on a boat

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There’s only one fusion device on earth that has been able to meet a key scientific threshold, but Martime Fusion CEO Justin Cohen is already preparing to put a fusion reactor on a boat.

Stay with me — it’s not entirely far-fetched. Thanks to advances in AI, computing, and superconducting magnets, fusion power is closer than ever to commercial reality. It’s increasingly looking like fusion is more a question of “when” not “if.” And when it does happen, it promises to deliver large amounts of clean power from a plentiful fuel source — water.

Putting a reactor on a ship isn’t necessarily unreasonable, either. Today, submarines and aircraft carriers powered by nuclear fission reactors routinely prowl the seas. They’re quiet, powerful, and can operate for decades before they need refueling. The civilian sector even toyed with the idea of nuclear-powered cargo ships back in the 1960s and 1970s.

“Fission has definitely paved the way in terms of nuclear power on ships,” Cohen, who co-founded Maritime Fusion, told TechCrunch. 

Fusion promises to give ships similar capabilities but without concerns over meltdowns, proliferation, or radiation. For now, the sector has been focused on building the first reactors on land. “I’m pretty sure we’re the first people to ever really look at what is it like to put a tokamak on a ship,” Cohen said, referring to a leading fusion reactor design.

If fusion does pan out, then Maritime’s leap to the seas would put it ahead of the curve. Plus, Cohen argues, it might actually be easier from a business perspective to start out at sea.

The first fusion power plants won’t be cheap, and it will take some time before they come down in cost.

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“Competing against things like solar and wind on the grid is super challenging from a cost perspective,” Cohen said.

At sea, the economics look different. Ammonia and hydrogen are two leading contenders to replace diesel and bunker fuel on cargo ships, but they’re still pretty pricey.

“Those are some of the other really expensive fuels that might actually be the only other things that are as expensive as first-of-a-kind fusion,” Cohen said. “In those cases, we actually do compete, just straight up.”

To flesh out its concept and start building parts for its first reactor, Maritime Fusion has raised $4.5 million in a seed round led by Trucks VC with participation from Aera VC, Alumni Ventures, Paul Graham, Y Combinator, and several angel investors, the startup exclusively told TechCrunch. The company was part of Y Combinator’s winter 2025 batch.

Maritime has begun assembling high-temperature superconducting (HTS) cables from tape it buys from suppliers, which are mostly Japanese companies, Cohen said. Those cables will ultimately form the basis of powerful magnets the tokamak will need to confine the plasma required for fusion reactions. They will also be sold to other companies to generate revenue as the Maritime develops its power plant, he said.

A superconducting cable sits inside a workshop.
Maritime Fusion’s superconducting cable undergoes testing at its workshop.Image Credits:Maritime Fusion

The startup expects its first power plant, named Yinsen, will generate around 30 megawatts of electricity.

Some of the biggest engineering challenges, will be designing the support systems that harvest energy and keep the tokamak running, Cohen said. To simplify the onboard equipment, some of the ancillary tasks, like fuel processing, will be carried out on shore, he said.

The first Maritime tokamak will be about eight meters across, and the startup is projecting it will be operational in 2032 and will cost around $1.1 billion.

For comparison, Commonwealth Fusion Systems (CFS), largely considered to be the leader in fusion race, is building Sparc, a smaller tokamak at just under five meters across. The company has raised almost $3 billion to date, much of which has gone toward building the demonstration plant, which it expects to bring online next year.

Sparc won’t put power on the grid; instead, its goal is to prove that tokamaks can generate more power than they consume. CFS’s full-scale, grid-powering reactor, Arc, won’t be ready until the early 2030s. 

CFS has a considerable head start over many fusion startups, including newcomer Maritime. Yet Cohen is confident that won’t be an impediment.

“We’re not going to spend billions on a breakeven-style device that doesn’t produce energy on the gird,” he said. “The first tokamak we build will be an energy-producing tokamak for a customer.”

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Waymo starts autonomous testing in Philadelphia

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Waymo is adding another four cities to its growing list of robotaxi rollouts. The company announced Wednesday it has begun testing its autonomous vehicles (with a safety monitor) in Philadelphia, and that it will start manual driving to collect data in Baltimore, St. Louis, and Pittsburgh.

Waymo did not offer a timeline for when it plans to launch commercial services in those locations, nor do we know whether the Alphabet-owned company will partner with other companies to operate robotaxis in each one. That has been the move in cities like Atlanta and Austin, for example, where Waymo has partnered with Uber to advance its robotaxi rollout.

But the new locations join a list of over 20 cities where the company is either offering rides, prepping a commercial launch, or testing. Waymo is also now offering rides on freeways in Los Angeles, Phoenix, and the San Francisco Bay Area. The company plans to be doing one million rides per week by the end of 2026.

Waymo has done all this while claiming to be operating at a level five times safer than humans, according to data the company recently released.

But the expansion has not come without its issues. The National Highway Traffic Safety Administration is investigating how the company’s vehicles operate near school buses, after a Waymo was filmed driving around a stopped bus in Atlanta in September.

This week, Austin news outlet KXAN published a report showing Waymo’s vehicles have driven past school buses that were in the process of unloading or loading children multiple times — including after Waymo claims to have shipped software updates to address the problem.

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Spotify Wrapped 2025 adds its first multiplayer feature with ‘Wrapped Party’

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Spotify Wrapped is back. After last year’s widely criticized flop that included an AI podcast as its highlight, the streamer’s highly anticipated annual review feature has returned to its roots. This year, Spotify is doubling down on what it knows works best: deep dives into your streaming data, creative experiences, messages from favorite artists, and other social features.

The company claims that Wrapped 2025 is its biggest, as it’s introducing nearly a dozen new features in addition to its old standbys, like top songs and artists. Plus, it’s offering more visibility into users’ data than in years past. For the first time, Spotify Wrapped is adding a live multiplayer feature to compare your listening data with friends.

Wrapped Party, Wrapped’s first live interactive experience, allows you to invite up to nine friends to compare listening stats.

Image Credits:Spotify

Also new this year, your Top Songs Playlist will include the play counts for each of the top songs, so you can actually see how much time you spent with your favorite tracks.

Other standout features this year include an interactive Top Song Quiz, a Listening Age feature, and Wrapped Clubs, which match you to one of six unique listening styles.

The company believes these additions will not only bring back the personalized, engaging experience that users have long expected from Wrapped, but will take it a step further by making it more interactive than before.

In the Top Song Quiz, for instance, you can try to guess which top song soundtracked your year before seeing the results.

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Image Credits:Spotify

The new interactive Wrapped Party feature isn’t just about comparing the personal streaming data you’ve already received to your friends’ data, as that’s something people already do on social media. Instead, the feature presents unique data stories for your group, like who’s the “most obsessed fan,” the “early bird,” the most “picky listener,” or even something as nice as the “dinner table explainer,” meaning the person who listens to the most news podcasts.

Image Credits:Spotify

Spotify says these awards update dynamically every time you join a Wrapped Party, so no two sessions are ever the same — even if you run through them again with the same group of friends.

The new Wrapped Clubs, meanwhile, will group you into one of half a dozen listening styles, like the “Soft Hearts Club,” the “Club Serotonin,” the “Full Charge Crew,” the “Cosmic Stereo Club,” and others. You’ll also receive a role in the club based on your listening data. You might be a club leader if your listening choices strongly matches the club’s values, a scout if you’re always seeking out new releases, or an archivist if you listen to music from past eras.

Image Credits:Spotify

Another feature, Listening Age, compares your 2025 music listening to others in your age group. To calculate your age, the feature considers the release years of the tracks you listen to most. From there, it identifies the five-year span of music that you engaged with more than other listeners your age.

Image Credits:Spotify

As in prior years, you’ll see your top songs, top artists, top genres, and, for the first time, top albums. If you engaged with audiobooks and podcasts, you’ll see metrics for those as well. Artists, writers, and podcasters will have their own version of Wrapped as before. And top fans will again receive video messages from their favorite artists, podcasters, and, now, authors.

You’ll also receive a playlist of your top songs of the year, as before.

Image Credits:Spotify

What you won’t find in this year’s Wrapped is any feature that advertises it was made with AI.

In a press briefing on Tuesday, Spotify’s Senior Director of Global Marketing, Matt Luhks, admitted the company received a “lot of feedback” about its 2024 AI-focused Wrapped experience, saying it was a “mix of positive and ‘more constructive feedback,’” despite the feature driving more engagement than prior years.

“We take all of that in. We use that as information, insights, [and] inspiration for how we approached Wrapped this year,” he said in a press event ahead of today’s launch.

“What our users tell us about Wrapped means a lot to us, so it was really informative in how we approached Wrapped this year. And what we tried to build was the most creative, most innovative, most engaging Wrapped ever,” he added, setting a high bar for the 2025 edition of the now 11-year-old annual year-in-review feature.

“We’re the original and, we believe, still the best,” Luhks said.

Image Credits:Spotify

Still, AI was a part of the Wrapped experience. Though the company claims the overall experience was not made with AI, it does leverage a LLM (large language model) to add a storytelling layer to Wrapped’s facts and figures, and natural language summaries in other parts of its experience, looking back on your data.

Spotify’s attempt to fix Wrapped after a notable stumble comes as the streamer faces increased competition from Apple, Amazon, YouTube, and others, which have all launched their own annual review features, inspired by Wrapped.

“Everyone seems to have their own version of Wrapped. Now, there’s a lot of reviews and replays and rewinds out there, but we believe that Wrapped still sets the bar for these year-end recaps,” Luhks said.

Along with the consumer experience, Spotify shared its top artists, songs, albums, podcasts, and audiobooks for the year, with top winners that included, respectively, Bad Bunny (top song and album), Joe Rogan (“The Joe Rogan Experience” podcast), and Rebeca Yarros (author of “Fourth Wing”).

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Nothing looks to its community to raise $5M, wants to be ‘IPO-ready’ in 3 years

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Hardware maker Nothing is letting its user base buy its stock as part of a new community investment round of $5 million. The new round, which opens on December 10, will enable consumers to buy the company’s shares at its Series C valuation of $1.3 billion.

The company said it has so far raised $8 million in total from over 8,000 people across two previous community investment rounds. It held its first community funding event in 2021, aiming to raise $1.5 million.

“This isn’t about raising capital, it’s about giving our community/fans a chance to invest while we’re private and join us on the journey,” a spokesperson for Nothing told TechCrunch.

Community investors have a rotating seat on the company’s board, but it is unclear what else they get for investing in the company through such rounds.

Nothing raised $200 million in its Series C back in September from investors including Tiger Global, GV, Highland Europe, EQT, Latitude, I2BF and Tapestry. The company has raised $450 million to date.

The community round comes as Nothing makes changes to its corporate structure as it tries to increase its share of a smartphone market dominated by giants like Samsung and Apple. The company is spinning off its budget CMF brand, and plans to explore AI-centric devices while it keeps building smartphones and audio products. And Nothing claims it crossed $1 billion in cumulative revenue this year, up 150% from 2024.

The startup is working to be “IPO-ready” in three years, CEO Carl Pei told TechCrunch in an email. “The timing will depend on market conditions and what makes sense for the business at that point in time,” he said.

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“What’s important is that we’re already operating with that discipline now. We’re building the systems, the governance, the financial discipline that a public company needs. It forces us to think longer-term and make smarter decisions that prioritise sustainable growth,” Pei added.

It’s not clear if Nothing aims to raise another round before an IPO. When asked about its fundraising plans, a Nothing spokesperson said the company is not thinking about raising capital immediately, but it wouldn’t be averse to those conversations.

Those interested in investing in the community round can use platforms like Wefunder and Crowdcube to participate.

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