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Engineer Builds What Could Quite Possibly be the World’s Most Efficient Drone

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World's Most Efficient Drone Quadcopter
Luke Maximo Bell was able to keep a drone airborne for more than 3 hours on a single battery charge, a remarkable feat of endurance engineering. Bell has a reputation for pushing the limits, and in 2022 he set a global speed record with his Peregrine quadcopters, so it’s no surprise to see him take on this new task.



Bell designed this drone with sheer staying power as his goal from the start, wanting it to survive as long as possible on a single charge, so he made every single decision with that in mind. He used massive 40-inch carbon fiber propellers from T-Motor that turn slowly on low-KV motors, requiring less power than smaller, faster-spinning propellers. These G40 propellers were combined with MN105 V2 Antigravity motors with a 90 KV rating, the lightest unit capable of handling the prop size without adding excessive weight.


DJI Neo 2 (Drone Only), Lightweight & Foldable 4K Drone With Camera, Palm Takeoff & Landing, Gesture…
  • Lightweight & Portable Design – Weighing just 151g [9] and C0 certified, this compact drone features full-coverage propeller guards for safer…
  • Palm Takeoff & Landing [1], Gesture Control [2] – Enjoy easy palm takeoff and landing, plus intuitive gesture controls for hands-free operation and…
  • Smooth & Reliable Tracking – ActiveTrack [3] keeps your subject in focus, while Apple Watch lets you view live feed, check flight status, or use voice…

The drone is powered by Tattu’s semi-solid state NMC LiPo packs, which provide approximately 320 watt-hours per kilogram of battery, which is roughly double the energy density of normal lithium-polymer cells and a significant advantage for anyone trying to build a long-lasting drone. To make things even more efficient, Bell removed 180 grams of packaging from each battery and replaced hefty connectors with lighter ones, saving a total of 360 grams, which is approximately equal to the weight of the complete carbon fiber frame. Depending on the air flow, it hovers around 400 watts, but drops to 250 watts during gradual forward motion as the air flow increases lift.

World's Most Efficient Drone Quadcopter
Bell paid special attention to the length of the drone’s arms, which is not something you think about all the time but is quite important. He used computational fluid dynamics simulations in AirShaper to test various arm length combinations before deciding on an 800mm length that appeared to produce the best results. Going too short can result in wake interference between propellers, while going too long adds unnecessary weight. The wires received the same level of attention; he chose 18 AWG gauge wire and utilized it for all 11m or so of wire per engine, weighing the resistance losses against the energy cost of utilizing additional copper.

World's Most Efficient Drone Quadcopter
To keep things simple and reliable, he limited the electronics to a minimum: a Holybro Nano Drive 4-in-1 ESC handles power distribution, a TBS Lucid H7 flight controller runs INAV firmware, a Matek GPS device gives position data, and a DJI O4 Air device feeds video feed back to base. Early versions of lighter components failed, so he replaced them with tested parts to avoid similar problems. The frame is comprised of carbon fiber tubes, with 3D printed arms, mounts, and legs.

World's Most Efficient Drone Quadcopter
Bell conducted numerous studies to build the drone, including bench tests that examined the thrust to power ratio under various loads, and he was pleased to discover that efficiency decreases as thrust increases, which is a good thing because he was then able to keep the weight down while keeping the thrust up. The first few flights were problematic, with a few oscillations and broken parts, but he learned from each failure to improve the next iteration.

World's Most Efficient Drone Quadcopter
In the end, the drone flew for more than 3 hours and 30 minutes without incident, even when pounded by winds; at 2 hours and 14 minutes, it had already surpassed SiFly’s hover time with plenty of juice remaining. Forward flight testing revealed a clear efficiency boost, and the drone landed successfully with the battery at 2.95 volts to avoid damage, an unofficial record that puts it far ahead of the current benchmark.

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Yet another lab-grown protein firm flops in Singapore, 3rd in three years

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Singapore’s appetite for alternative meat seems to be waning, with yet another lab-grown meat company biting the dust.

Cultivated meat company Avant Proteins is shutting down its Singapore operations, reported a notice on Singapore’s Government Gazette.

The seafood cell research company declared on Jan 30 that it was voluntarily winding up its business here due to its liabilities.

Alternative proteins are foods that have the same taste, texture, and experience of animal products that consumers love–just made in different ways. They comprise plant-based food, cultivated (lab-grown) meat or fungi-based derivatives from fermentation.

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Avant Proteins is a research firm founded in 2018 by Hong Kong-based Avant, which calls itself Asia’s first cultivated fish company. The former had goals of producing fish meat without killing them.

As of Feb 10, the firm’s Hong Kong entity, Avant Meats Company, remains a private company limited by shares, according to the Hong Kong Companies Registry.

Avant Proteins’ departure from Singapore is the latest of at least three lab-grown meat companies that have struggled to scale operations in the Republic, years after it hit global headlines in 2020 as the first country to approve the commercial sale of cultured meat.

Cultivated meat is made by growing animal cells in bioreactors, a process similar to brewing beer.

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This approach is considered more humane and sustainable than traditional farming, using far less land and labour.

However, the sector has faced hurdles since 2023, struggling to scale up due to difficulties in commercialising the technology, high costs, and uncertain consumer demand.

Avant’s co-founder Carrie Chan told The Straits Times in 2024 that investors had become “more conservative” due to economic conditions.

“Some are thinking (this sector) is more challenging, and they should not be investing in anything at the pre-revenue stage as the tech involved can be difficult to scale up quickly,” Chan said back then.

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Checks on the Accounting and Corporate Regulatory Authority’s database found that Avant Biotechnology was still live, while Avant Proteins is in liquidation, as at Feb 11.

Short life span in Singapore

avant meats protein cell-based fish seafood fish maw ballsavant meats protein cell-based fish seafood fish maw balls
Avant Meats’ cell-based fish maw balls./ Image Credit: Avant Meats

After establishing itself in Hong Kong in 2018, Avant revealed plans in 2021 to expand into Singapore by opening a research lab in collaboration with A*STAR’s Bioprocessing Technology Institute (BTI).

The lab was launched to scale up production of food-grade cultivated fish fillets and fish maw.

A*STAR stated that the collaboration concluded as scheduled two years later, with Avant establishing its own pilot facility in Woodlands.

“Through this work, A*STAR BTI and Avant Meats gained valuable insights into upstream bioprocessing, production challenges and scale-up considerations,” it said.

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According to its latest LinkedIn post, Avant subsequently ramped up operations at its Woodlands pilot facility, noting that it had contributed to public education on the future of animal proteins.

The post also highlighted that the company had commercialised skincare technology using cultivated fish cells and continued to advance its cultivated fish products toward approval by the Singapore Food Agency.

However, as of Feb 11, Avant Meats’ website—which showcased both its skincare line and lab-grown meat—went offline, though the site for its skincare technology remains active.

Restaurants are axing plant-based meat from their menus due to high costs and low demand

impossible beef beyond burger veganburg chili krab burger konjacimpossible beef beyond burger veganburg chili krab burger konjac
(L to R) Beyond Burger and Impossible Beef are some of the well-known plant-based patties in the market that mimic the taste of real minced beef; Veganburg’s Chili Krab burger features a konjac ‘crab’ patty./ Image Credit: Sheila Fitzgerald via Shutterstock, Veganburg

Once a prominent menu feature, plant-based meat dishes have quietly disappeared from several restaurants, while others have reduced their selections or moved them to optional add-ons at an extra charge, said a Channel News Asia report.

The global appetite for plant-based meat saw the sharpest rise between 2018 and 2020. During this period, numerous casual dining chains, even Asian restaurants, jumped on the trend, incorporating plant-based “Impossible” meat options into their menus.

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Experts linked the surge to a combination of factors: aggressive marketing, rising consumer interest in health-conscious and sustainable eating, and, in Singapore, the government’s focus on alternative proteins to bolster food security.

They’ve also noted that the appeal of plant-based meats has declined once the novelty faded. Improvements in taste and texture still lagged behind expectations and struggled to justify their high prices.

Instead of imitating meat, some restaurants are shifting their focus to whole-food, plant-based options.

For example, vegan burger eatery Veganburg has emphasized whole-food vegan patties over highly processed meat substitutes. Its operations director, Blessed Chee, noted that the store discontinued Impossible plant-based meat due to cost considerations.

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A 340g packet of minced Impossible beef retails for S$12.12 while 1kg of real minced beef costs S$11.35 on Fairprice’s website.

Is cultivated meat heading in the same direction to becoming a flop?

Previously, California-based Eat Just had suspended its cultivated meat production in Singapore, while local company Shiok Meats merged with Singapore-based Umami Bioworks, a specialist in marine cell cultivation.

For years, companies have promised that commercially-viable lab-grown meat was right around the corner, but repeated missed product launches and setbacks have eroded investor confidence in the space. From 2024 to 2025, total investment in the cultivated meat industry dipped by 74%, from US$139 million to US$36 million.

Only time will tell if lab-grown meat will follow in plant-based meat’s footsteps or carve a direction of sustaining a presence here in Singapore.

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  • Read other articles we’ve written on Singaporean businesses here.

Featured Image Credit: Avant Proteins

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Daily Deal: Nix Mini 3 Color Sensor

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from the good-deals-on-cool-stuff dept

Instantly become a color expert with the Nix Mini 3 Color Sensor. This portable device puts all paint fan decks in your pocket, offering access to over 200,000 brand-name paint colors and essential color codes like RGB, HEX, and CMYK. Perfect for designers, contractors, and homeowners. The Mini 3 features Bluetooth connectivity, Debris and splash resistance, and free access to the Nix Toolkit app for precise and convenient color matching. This newest version improves accuracy with 3x enhanced resolution over the Mini 2 and significant improvements to battery life and Bluetooth connectivity. The Nix Mini 3 ensures reliable color management for any project. Additionally, it matches premium libraries like Pantone, RAL, and NCS with monthly or annual subscription options. It’s on sale for $69.97 for a limited time.

Note: The Techdirt Deals Store is powered and curated by StackCommerce. A portion of all sales from Techdirt Deals helps support Techdirt. The products featured do not reflect endorsements by our editorial team.

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Zillow tops estimates with $654M in Q4 revenue, up 18%

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(Zillow Image)

This story originally appeared on Real Estate News.

Despite all of the headlines Zillow faced last year involving various court cases, the company continued to outperform investor expectations in the fourth quarter.

Zillow’s revenue was up 18% for Q4 of 2025 and up 16% for the full year, according to its Feb. 10 earnings report. Zillow’s quarterly revenue, which came in at $654 million, was at the upper end of Zillow’s guidance and was slightly higher than what investors had projected.

The biggest percentage increases in revenue came from Zillow’s mortgage and rental divisions, which are both the focus of lawsuits that were filed last year. Revenue from the company’s mortgage division was up 39% to $57 million, while rental revenue was up 45% to $168 million.

And even though 2025 was a slow year for home sales nationally, traffic to Zillow’s websites and apps were up 8% in Q4 and visits were up 2% for the entire year.

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“We delivered strong results in the fourth quarter and throughout 2025, achieving all our reported full-year financial targets, including positive net income, while continuing to gain share in both For Sale and Rentals,” Zillow CEO Jeremy Wacksman said in a news release.

“As we celebrate 20 years of Zillow, our results demonstrate our disciplined and consistent execution of our strategy,” Wacksman added.

Key numbers

Revenue: $654 million in Q4, up 18% year-over-year. Residential revenue increased 8% to $418 million, mortgage revenue was up 39% to $57 million, and rentals revenue climbed 45% to $168 million.

For the full year, revenue was $2.6 billion, up 16% compared to 2024.

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Cash and investments: $1.3 billion at the end of 2025, down from $1.4 billion at the end of September.

Adjusted EBITDA (earnings before interest, taxes, depreciation and amortization): $149 million in Q4, up from $112 million a year earlier.

Net income/loss: A gain of $3 million in Q4, up from a $52 million loss a year ago. Zillow reported a net income gain of $23 million for the full year compared to a $112 million loss in 2024.

Traffic and visits: Traffic across all Zillow Group websites and apps totaled 221 million average monthly unique users in Q4, up 8% year-over-year, the company said. Visits were up 2% year-over-year to 2.1 billion.

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Q1 outlook: For the first quarter, Zillow estimates revenue will be in the $700 million to $710 million range.

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Stoke Space adds $350M to funding round as it gets ready for the first launch of its reusable rocket

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A propellant tank takes shape at Stoke Space's rocket factory in Kent, Wash.
A propellant tank takes shape at Stoke Space’s rocket factory in Kent, Wash. (Stoke Space Photo)

Kent, Wash.-based Stoke Space Technologies says it has added another $350 million to its previously announced Series D financing round, bringing the amount raised in the round to $860 million.

The fresh funding will go toward completing activation of the company’s Florida launch complex and expanding production capacity for its fully reusable Nova launch vehicle. Additional capital will be used to accelerate future elements on Stoke’s product road map.

Terms of the round were not disclosed. With the extension of the Series D round, Stoke has raised $1.34 billion to date.

The medium-lift Nova rocket is currently under development. First liftoff from Launch Complex 14 at Cape Canaveral Space Force Station is expected sometime this year.

“We’re extremely grateful for our investors’ continued support,” Andy Lapsa, Stoke’s co-founder and CEO, said today in a news release. “We’re executing with urgency to bring Nova to market and deliver for our customers. It’s a special vehicle, and there’s more in the pipeline — we look forward to sharing those developments as they mature.”

Nova’s first-stage booster is designed to fly itself back to a landing pad, following a procedure similar to that used by SpaceX for its Falcon 9 rocket. The second stage would use an actively cooled heatshield to ease its descent through the atmosphere, and then touch down on its own set of landing legs.

While SpaceX and Blue Origin are focusing on heavy-lift rockets such as Starship and New Glenn, Stoke is targeting the medium-lift launch market. Even though Stoke Space hasn’t yet launched a rocket to orbit, it was added to the U.S. Space Force’s list of providers for national security launches last year.

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Best Speakers of 2026 – CNET

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Whether you’re interested in background music for your next party or you’re looking to upgrade a stereo system, there’s a speaker set ready for you. Speakers tend to be designed with a specific purpose in mind. For example, you might need speakers for your TV, computer speakers or a set for a specific room. Or perhaps you need portable Bluetooth speakers to take on a trip. There’s a speaker for every situation.

BLUETOOTH SPEAKER DEALS OF THE WEEK

Deals are selected by the CNET Group commerce team, and may be unrelated to this article.

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Not all speakers are created equal

I’ve highlighted the best wired and wireless speakers I’ve tested costing between $50 and $1,000. While most of the included systems are powered speakers, you’ll also find passive bookshelf speakers, such as the Elac Debut 2.0 B6.2, which just need to be paired with a great AV receiver

From smart speakers to outdoor speakers to immersive home theater systems, every model I’ve chosen boasts great sound quality and is the best speaker in its particular category. I’ll update this list periodically as we review new products, so you can take your audio setup to the next level.

Read more: Best Soundbar for 2025

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With great sound, a compact size and the Alexa voice assistant built-in, the Sonos Era 100 packs a lot of punch, making it the best smart speaker for the money.

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Elac has been belting out classic, affordable designs ever since its, er, debut in 2015. The Debut 2.0 exemplifies the brand’s appeal to both the budget-conscious and audiophiles. It offers a lively, insightful sound and attractive looks for around $400.

Pros

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  • Big, generously proportioned speakers
  • Excellent sound quality perfect for long binge sessions
  • Nothing holds a candle to it for the money

Cons

  • Could be smoother, especially with its lower register
  • Dustcaps didn’t quite line up

Want the biggest sound? You’ll need big speakers. The fit and finish of the large Fluance XL8 towers is unmatched by other speakers at its price. The sound of the XL8F is open and thrilling, but never shrill, and when fed a movie soundtrack these speakers simply zing. They’re no slouch with music either. If you truly want the maximum speaker for your money, the huge Fluance XL8F has no equal.

Pros

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  • Very compact (pocket-friendly)
  • More bass and volume than most speakers this small
  • Waterproof and dustproof (IP67)
  • Integrated strap
  • Can be linked to another StormBox Micro for stereo mode
  • USB-C charging
  • 8 hours of battery life

Cons

  • Not as durable as Bose SoundLink Micro
  • Distorts slightly at higher volumes with certain tracks

Budget Bluetooth speakers are seemingly a dime a dozen, but among the countless options there do lie some gems. The $50 Tribit Stormbox Micro is a compact, portable speaker that offers both waterproofing and excellent bass for its size.

Pros

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  • Compact, easy to set up and affordable
  • Excellent dialogue reproduction
  • Tried and true Roku experience

Cons

  • Lacks bass in movies and music

The $130 Roku Streambar is a hybrid soundbar-4K video streamer and the most welcome surprise is that it’s able to perform both tasks well. Pair it with a bedroom TV and the optional Onn Wireless Sub for a killer home theater setup.

If there was ever a bargain in home theater it was this — for around the same price as the Elac speakers above you can get a full Dolby Atmos setup. With a sub! Sound quality is excellent and the Klipsch kit includes all of the cables you need in the box.

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The Edifier R1280DB offers almost everything you could want in a PC speaker — excellent sound, a range of connections including Bluetooth and a compact footprint — and all for a reasonable $150. It doesn’t offer USB, though, so connect the headphone/line out of your PC to it instead.

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Pros

  • Excellent sound in a compact size
  • Amazon Alexa onboard
  • DTS Virtual:X
  • Articulate subwoofer

The Yamaha YAS-209 is one of the most fully featured soundbars the company has ever offered — especially at the price. With Alexa, HDMI connectivity and a wireless subwoofer, this soundbar doesn’t want for anything. The sound quality is great, too.

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Pros

  • Motorized speakers work well.
  • Excellent sound for movies and music.
  • Plenty of connections
  • Includes rears and wireless sub.

Cons

  • Not as easy to use as Sonos Arc
  • No Apple AirPlay support
  • Somewhat short surround cables

The Vizio Elevate may have one big gimmick at the core of it, that revolving height speaker, but it also offers sound quality to back up the gee-whizzery. This is a 5.1.4 Dolby Atmos soundbar, with a hefty subwoofer, and its performance is equally thrilling in both movies and music. Add in a bunch of streaming features and you have the best surround system under a grand.

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Techdirt Podcast Episode 443: The Supreme Court’s Internet Cases

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from the taking-an-interest dept

In the last few years, the Supreme Court has been paying a lot more attention to the internet than it ever has before, and the cases keep on coming. This is already having a big impact on how the internet functions, and it doesn’t look likely to stop any time soon. Given all that, this week our own Cathy Gellis joins the podcast for a discussion all about the past, present, and future of SCOTUS and the internet.

You can also download this episode directly in MP3 format.

Follow the Techdirt Podcast on Soundcloud, subscribe via Apple Podcasts or Spotify, or grab the RSS feed. You can also keep up with all the latest episodes right here on Techdirt.

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Filed Under: podcast, scotus, supreme court

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Managing your brand’s narrative in the AI age

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Earned media has always been hailed as the holy grail of PR due to its unparalleled ability to build trust. Most recent surveys state that 40%–60% of the population still trusts organic content the most, depending on the country. However, I see significant business risks in relying on organic PR only, especially now that various AI systems are on the rise. Robots don’t distinguish between earned and paid content when using it to generate answers. And that’s a wake-up call for us all to revise our PR strategies. The potential dangers of earned-only PR strategies The primary advantage of earned media,…
This story continues at The Next Web

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OpenAI policy exec who opposed chatbot’s “adult mode” reportedly fired on discrimination claim

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Ryan Beiermeister, who served as OpenAI’s vice president of product policy, was fired in January after a male colleague accused her of sex discrimination, the Wall Street Journal has reported.

“The allegation that I discriminated against anyone is absolutely false,” Beiermeister told the Journal. TechCrunch reached out to OpenAI for comment and also contacted an email that appears to be associated with Beiermeister; neither had responded at the time of publication.

Per the Journal’s report, Beiermeister’s termination came after she expressed criticism of a planned ChatGPT feature dubbed “adult mode.” The new mode would introduce erotica into the chatbot user experience. Fidji Simo, who serves as OpenAI’s CEO of Applications — a role overseeing the company’s consumer-facing products — has told reporters that the new feature is planned to launch during the first quarter of this year.

Beiermeister and others at the company have raised concerns about how the new “adult” feature could potentially impact certain users, according to the report.

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OpenAI reportedly said that Beiermeister, who was fired following a leave of absence, had “made valuable contributions during her time at OpenAI, and her departure was not related to any issue she raised while working at the company.” 

Beiermeister’s LinkedIn profile says she previously worked for four years on Meta’s product team and spent more than seven years working for Palantir.

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Discord Tries To Walk Back Age Verification Panic, Says Most Users Won’t Need Face Scans

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Discord has moved to calm a user backlash over its upcoming age verification mandate by clarifying that the “vast majority” of people will never be asked to confirm their age through a face scan or government ID.

The platform said it will instead rely on an internal “age prediction” model that draws on account information, device and activity data, and behavioral patterns across its communities to estimate whether someone is an adult. Users whose age the model cannot confidently determine will still need to submit a video selfie or ID.

Those not verified as adults or identified as under 18 will be placed in a “teen-appropriate” experience that blocks access to age-restricted servers and channels. The clarification came after users threatened to leave the platform and cancel Nitro subscriptions, and after a third-party vendor used by Discord for age verification suffered a data breach last year that exposed user information and a small number of uploaded ID cards.

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Android 17 Beta 1 is around the corner, will skip the traditional Developer Preview stage

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While Android beta testers were exploring the newly-launched Android 16 QPR3 Beta 2.1, Google decided to surprise everyone. The official Android Beta Program handle on Reddit has confirmed the arrival of Android 17 Beta 1, and it’s coming sooner than you’d think.

“We are looking forward to our next Beta program cycle that covers our Android 17 Platform Release (26Q2),” says Google. It says the upcoming update will build on the Android 16 QPR platform release and include the “latest bug fixes and improvements.”

A surprise at the end of the cycle

The timing isn’t exactly shocking, as Android 16 QPR3 Beta 2.1 is the last update in the cycle. What’s unique, however, is Google’s route. Instead of pushing Android 17 via the Developer Preview stage, the company is jumping straight into the first beta.

Current beta testers (those enrolled in the Android Beta Program with an eligible Pixel smartphone) will automatically receive the Android 17 update once it goes live (which could be sometime in the coming weeks).

On the one hand, it’s good that Google is seeding the Android 17 update promptly to beta testers, making the initial build available for a wider testing audience.

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The fine print beta testers shouldn’t ignore

However, once testers upgrade to Android 17 Beta 1, they won’t be able to roll back to the previous stable version until the cycle ends (which would be around June 2026) without wiping their device.

Anyways, that also implies that Google is planning to release the stable Android 17 version around the same time. Regular users should expect the major Android update to hit their Pixel devices in or around June 2026.

As for what’s new in Android 17 Beta 1? Google hasn’t spilled the beans yet. Even so, we expect to see the usual early-beta performance improvements and software refinements, sprinkled with a couple of visual adjustments.

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