Tech
Sweat-powered sticker turns your drinking cup into a health sensor
A team of engineers at the University of California San Diego has developed an electronic sticker that can monitor a person’s vitamin C levels using the sweat from their fingertips—no blood draws, lab visits or batteries required. The flexible sticker, which attaches to the outside of a drinking cup, collects trace amounts of sweat as a person grips the cup. Within minutes, the system harvests enough power from the sweat to analyze it for vitamin C and wirelessly sends the results to a nearby laptop.
Details about the device are published in Biosensors and Bioelectronics.
“By turning everyday objects like cups or bottles into smart sensors, people can gain real-time insights into their health and wellness without changing a thing about their daily routine,” said study co-senior author Patrick Mercier, a professor in the Department of Electrical and Computer Engineering at the UC San Diego Jacobs School of Engineering.
“We’re moving toward a future of ‘unawareables’—devices that are unobtrusive and essentially invisible so that you are unaware that you’re even using them. You just go about your day and your drinking cup can give you access to all this rich information.”
Malnutrition and micronutrient deficiencies continue to affect millions of people worldwide. While vitamin C plays a key role in immune function, tissue repair and iron absorption, testing for it currently requires blood draws, specialized laboratory equipment and costs around $50 per test in the U.S. These barriers make frequent monitoring impractical for many people.

The new sticker offers a simple, convenient and low-cost alternative. Built on a flexible, adhesive polymer sheet, the system integrates screen-printed electronic components. A porous hydrogel pad mounted on the sticker collects sweat from the fingertips. A built-in biofuel cell converts chemicals in the sweat into electricity, which powers a custom printed circuit board and the vitamin C sensor. The circuit board reads signals from the vitamin C sensor and wirelessly transmits the data via Bluetooth low energy.
“Most people only get a snapshot of their health once a year at the doctor. But our bodies change much more frequently than that,” Mercier said. “We want to make access to health data as frequent and effortless as holding your morning coffee cup or orange juice bottle.”
Another special feature of the sticker is that it generates power without requiring physical exertion from the user. Fingertips, despite their small size, are among the body’s most prolific sweat producers—each is packed with over a thousand sweat glands and can produce between 100 and 1,000 times more sweat than most other areas on the body. This steady trickle of natural perspiration provides a continuous energy source that allows the sticker to operate even when the user is at rest.
Because the system is battery-free, it can be manufactured at low cost—potentially for just a few cents per unit. Its affordability could also make future versions of the system disposable and widely accessible, particularly in low-resource areas.
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Study co-first author Muhammad Inam Khan, a nano engineering Ph.D. student at the UC San Diego Jacobs School of Engineering, demonstrates fingertip placement on the sticker while gripping a boba drink. Three fingertips rest on the arched biofuel cell (left) while the tip of the middle finger rests on the vitamin C sensor (right). Credit: David Baillot/UC San Diego Jacobs School of Engineering
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Study co-first author Ryan Burns, an electrical and computer engineering Ph.D. student at the UC San Diego Jacobs School of Engineering, uses the sticker on a cup filled with orange juice. Credit: David Baillot/UC San Diego Jacobs School of Engineering
The work is a collaboration between the labs of Mercier and Joseph Wang, a professor in the Aiiso Yufeng Li Family Department of Chemical and Nano Engineering at the UC San Diego Jacobs School of Engineering. It builds on wearable technologies that Wang’s lab has pioneered—including tattoo-like biochemical sensors and fingertip-power wearables—along with ultra-low power, battery-free wireless systems developed in Mercier’s lab.
In tests, the device was stuck onto a disposable drinking cup and accurately tracked changes in vitamin C levels after participants took a supplement or drank orange juice. The device powered itself for more than two hours using only sweat-derived energy.
“This is an elegant extension of our early fingertip sweat-based technology toward effortless, continuous monitoring of personal nutrition and health,” said Wang, one of the study’s co-senior authors. “By moving sensors from the skin to the surface of everyday objects like cups or bottles, we are expanding what wearable technology can be.”
The team plans to expand the technology to measure additional nutrients and biochemicals. Future versions could send readings directly to smartphones or smartwatches to provide more seamless, real-time tracking of personal health data throughout the day.
Co-authors of the study include Muhammad Inam Khan, Ryan Burns, Akshit Agarwal, Lu Yin, Jongmin Moon, Bumsik Choi, Shichao Ding and Tamoghna Saha, all at UC San Diego.
More information:
Muhammad Inam Khan et al, A smart cup for wireless, biofuel-powered, sweat-based vitamin C sensing, Biosensors and Bioelectronics (2026). DOI: 10.1016/j.bios.2025.118100
Citation:
Sweat-powered sticker turns your drinking cup into a health sensor (2025, November 10)
retrieved 10 November 2025
from https://techxplore.com/news/2025-11-powered-sticker-cup-health-sensor.html
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Tech
‘Uncanny Valley’: Iran’s Threats on US Tech, Trump’s Plans for Midterms, and Polymarket’s Pop-up Flop
Kate Knibbs: So, you went twice?
Makena Kelly: Yes, Kate. I went twice.
Kate Knibbs: I missed that.
Zoë Schiffer: Wait, is the Pentagon Pizza thing a joke about the pizza predicting the war?
Makena Kelly: Yeah.
Zoë Schiffer: Oh, my God.
Makena Kelly: Because they had these Pentagon pizza trackers up. When I returned the second night, yes, I came back the second night. Everything was working for the most part. There were still some screens that were turned off, but I never saw any actual Bloomberg terminals. There were some monitory Bloomberg type terminal things that it looked like Polymarket had developed themselves, but the real $50,000 Bloomberg terminal was nowhere to be found. And yeah, the second night, again, it was mostly people looking to gawk at the event, except I did find a couple of people who placed some bets on platforms like Polymarket and Kalshi. One was named William, and he said he was a member of the military, wouldn’t give me his full name. And he last year got involved in this for the first time by putting in, I think, all of his tax return into Oklahoma City sports betting.
Makena Kelly, archival audio: So, you used Kalshi?
William, archival audio: Yes.
Makena Kelly, archival audio: When did you first start using the service?
William, archival audio: Probably when I got my tax return back.
Makena Kelly, archival audio: OK.
William, archival audio: So, I filed my taxes pretty early and I was like, “Oh, sweet. I got my tax return. What am I going to do with it?” So, I was like, “I’m going to just put it on Kalshi.”
Makena Kelly: He said that he goes up and down 100 dollars, but he hasn’t made any major winnings. Some of the stuff that we’ve heard. Some people making crazy insider bets making millions and millions of dollars. This is just a guy who was interested in this and just plays it for fun, it sounds like.
Brian Barrett: Kate, what do you see when you see a pop-up like this and Polymarket trying to—is it an attempt to legitimize itself to just a marketing stunt? And how does it tie into what you’re seeing with these companies anyway, that there’s the explosive growth that they’ve got trying to reach out to so many people and getting so many people hooked on what they’re offering?
Kate Knibbs: I mean, this particular event definitely seems like a very bald effort to woo DC-based journalists, if nothing else. One thing that Makena said sort of encapsulates what’s going on right now, the thing about the guys in the Palantir hoodies. So, I think it was the same week that this bar opened. Polymarket announced a partnership with Palantir and Palantir is helping them protect the integrity of their sports market. So, Palantir is going to be basically attempting to help Polymarket catch insider traders and market manipulators in all the sports games, which is kind of wild. I actually asked Polymarket last week whether they had any other deals with Palantir when I was trying to get them to say anything about whether they were investigating the Iran bets that have been raising a lot of eyebrows. And they said that Palantir was only helping them with sports, which I thought was freaking weird. And it speaks to how they’re rapidly expanding, but doing so in this really messy ad hoc way that doesn’t really make a lot of sense. Because I was like, “If you’re going to get Palantir involved, why wouldn’t you have them do this geopolitical stuff instead of March Madness?” Yeah, wild, wild times.
Tech
The Google Pixel 10 Is $150 Off
On the hunt for a new Android smartphone? Amazon currently has the 128GB Pixel 10 in Obsidian marked down to just $649, $150 off its usual price. It’s one of our favorite Android smartphones, particularly for users who take a lot of photos.
The biggest advantage to a Pixel over other Android smartphones is that you get the latest features from Google as soon as they’re available, often before other brands implement them. There are special camera modes that let you stitch together multiple group shots, or help you improve the angle and lighting with helpful tips. You’ll also find novel features like real-time translations and spam call screening, and Google even figured out how to let you AirDrop files with iOS users.
All of that functionality is powered by some of the better hardware you can find in an Android phone. The Pixel 10 sports a 6.3-inch OLED display with a 120Hz refresh rate for gaming and smoother scrolling. The Tensor G5 is a step up from the 10a’s Tensor G4 chip, and sports 12 GB of memory for better performance. They even support Qi2 wireless charging, making them compatible with existing MagSafe accessories.
While the Pixel 10a will satisfy most folks, the Pixel 10 offers a variety of upgrades over the more basic model, most of which pertain to the cameras and image processing. The rear camera has a proper 5X optical zoom, letting you nail those nature shots without scaring the wildlife, and the front camera sports auto-focus, which will make your big group selfies less of a headache. Oddly, the battery is actually a bit smaller in the Pixel 10, but neither disappointed us when it came to longevity.
If you’re sold on the Pixel 10, I spotted the discounted $649 price point for the 128 GB model in both Obsidian and Lemongrass, or $749 in Indigo. If you need more storage, the Obsidian and Frost colors were both marked down to $749 for the upgraded 256 GB version. If you’re wondering what other Android smartphones we like, make sure to check out our in-depth guide with picks from Google, Samsung, and OnePlus.
Tech
OpenAI Buys Some Positive News
OpenAI announced Thursday that it had acquired the online business talk show TBPN for an undisclosed sum. The move comes as OpenAI struggles with its public image, which has taken a significant hit in recent months.
Since launching in 2024, TBPN has risen in popularity among Silicon Valley circles by offering a daily live stream about the technology industry that’s seen as more tech-friendly than traditional outlets. The show’s two hosts, John Coogan and Jordi Hays, offer real-time commentary on breaking news, cycle through viral social media posts, and interview executives from companies including Meta, Salesforce, Palantir and OpenAI. It’s become especially popular among OpenAI staff and other AI researchers, many of whom are addicted to the social media platform X.
It’s hard to understand how a media startup fits into OpenAI’s core businesses selling ChatGPT, Codex, and a new super app the company is developing to consumers and enterprises. Last month, OpenAI’s CEO of Applications, Fidji Simo, told staff in an all hands meeting that the company needed to cancel its side projects and refocus around its core businesses.
In a memo to staff announcing the acquisition, Simo said the typical communications playbook does not apply to OpenAI. “We’re not a typical company,” she said in the memo, which was also published as a blog. “We’re driving a really big technological shift. And with the mission of bringing AGI to the world comes a responsibility to help create a space for a real, constructive conversation about the changes AI creates—with builders and people using the technology at the center.”
TBPN is a small business compared to OpenAI. The media firm says it generated $5 million in ad revenue last year, and was on track to make more than $30 million in revenue in 2026, according to the The Wall Street Journal. The show reportedly reaches around 70,000 viewers per episode across a variety of platforms. A source close to OpenAI says the company doesn’t expect TBPN to contribute financially to the business, though it will help with OpenAI’s communications strategy.
OpenAI has fallen under increased public scrutiny in recent months. After the company signed a deal with the Department of Defense in February, Anthropic’s Claude surged in downloads and claimed the top spot among Apple’s free apps. OpenAI’s leaders are also dealing with a growing QuitGPT movement which is made up of people who vow to never use OpenAI’s products. OpenAI President Greg Brockman cited AI’s popularity issues as a core reason for his increased political spending.
The acquisition makes OpenAI the latest Silicon Valley player to try owning and operating a news business. In recent decades, there have been several notable examples of technology leaders purchasing media firms, including Jeff Bezos buying The Washington Post, Marc Benioff buying Time Magazine, and Robinhood buying the newsletter company MarketSnacks. In each case, the acquisitions raised immediate questions about whether the outlets would remain truly independent. In her memo, Simo told staff that TBPN will retain editorial independence.
“TBPN is my favorite tech show. We want them to keep that going and for them to do what they do so well,” said OpenAI CEO Sam Altman in a post on X. “I don’t expect them to go any easier on us, [and I] am sure I’ll do my part to help enable that with occasional stupid decisions.”
OpenAI said TBPN will continue to “run their programming, choose their guests, and make their own editorial decisions,” according to Simo’s memo The company also said that TBPN will report directly to OpenAI’s VP of global affairs, Chris Lehane. WIRED previously reported how an economic research team under Lehane had struggled to report on AI’s negative impacts on the economy.
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