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Sensors can read your sweat and predict overheating. Here's why privacy advocates care

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Sensors can read your sweat and predict overheating. Here's why privacy advocates care

On a hot summer day in Oak Ridge, Tennessee, dozens of men removed pipes, asbestos and hazardous waste while working to decontaminate a nuclear facility and prepare it for demolition.

Dressed in head-to-toe coveralls and fitted with respirators, the crew members toiling in a building without power had no obvious respite from the heat. Instead, they wore armbands that recorded their heart rates, movements and exertion levels for signs of heat stress.

Stephanie Miller, a safety and health manager for a U.S. government contractor doing cleanup work at the Oak Ridge National Laboratory, watched a computer screen nearby. A color-coding system with little bubbles showing each worker’s physiological data alerted her if anyone was in danger of overheating.

“Heat is one of the greatest risks that we have in this work, even though we deal with high radiation, hazardous chemicals and heavy metals,” Miller said.

As the world experiences more record high temperatures, employers are exploring wearable technologies to keep workers safe. New devices collect biometric data to estimate core body temperature – an elevated one is a symptom of heat exhaustion – and prompt workers to take cool-down breaks.

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The devices, which were originally developed for athletes, firefighters and military personnel, are getting adopted at a time when the Atlantic Council estimates heat-induced losses in labor productivity could cost the U.S. approximately $100 billion annually.

This article is part of AP’s Be Well coverage, focusing on wellness, fitness, diet and mental health. Read more Be Well.

But there are concerns about how the medical information collected on employees will be safeguarded. Some labor groups worry managers could use it to penalize people for taking needed breaks.

“Any time you put any device on a worker, they’re very concerned about tracking, privacy, and how are you going to use this against me,” said Travis Parsons, director of occupational safety and health at the Laborers’ Health and Safety Fund of North America. “There’s a lot of exciting stuff out there, but there’s no guardrails around it.”

VULNERABLE TO HEAT

At the Tennessee cleanup site, the workers wearing heat stress monitors made by Atlanta company SlateSafety are employed by United Cleanup Oak Ridge. The company is a contractor of the U.S. Department of Energy, which has rules to prevent on-the-job overheating.

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But most U.S. workers lack protections from extreme heat because there are no federal regulations requiring them, and many vulnerable workers don’t speak up or seek medical attention. In July, the Biden administration proposed a rule to protect 36 million workers from heat-related illnesses.

From 1992 to 2022, 986 workers died from heat exposure in the U.S., according to the Environmental Protection Agency. Experts suspect the number is higher because a coroner might not list heat as the cause of death if a sweltering roofer takes a fatal fall.

Setting occupational safety standards can be tricky because individuals respond differently to heat. That’s where the makers of wearable devices hope to come in.

HOW WEARABLE HEAT TECH WORKS

Employers have observed workers for heat-related distress by checking their temperatures with thermometers, sometimes rectally. More recently, firefighters and military personnel swallowed thermometer capsules.

“That just was not going to work in our work environment,” Rob Somers, global environment, health and safety director at consumer product company Perrigo, said.

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Instead, more than 100 employees at the company’s infant formula plants were outfitted with SlateSafety armbands. The devices estimate a wearer’s core body temperature, and a reading of 101.3 degrees triggers an alert.

Another SlateSafety customer is a Cardinal Glass factory in Wisconsin, where four masons maintain a furnace that reaches 3000 degrees Fahrenheit.

“They’re right up against the face of the wall. So it’s them and fire,” Jeff Bechel, the company’s safety manager, said.

Cardinal Glass paid $5,000 for five armbands, software and air-monitoring hardware. Bechel thinks the investment will pay off; an employee’s two heat-related emergency room visits cost the company $15,000.

Another wearable, made by Massachusetts company Epicore Biosystems, analyzes sweat to determine when workers are at risk of dehydration and overheating.

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“Until a few years ago, you just sort of wiped (sweat) off with a towel,” CEO Rooz Ghaffari said. “Turns out there’s all this information packed away that we’ve been missing.”

Research has shown some devices successfully predict core body temperature in controlled environments, but their accuracy remains unproven in dynamic workplaces, according to experts. A 2022 research review said factors such as age, gender and ambient humidity make it challenging to reliably gauge body temperature with the technology.

The United Cleanup Oak Ridge workers swathed in protective gear can get sweaty even before they begin demolition. Managers see dozens of sensor alerts daily.

Laborer Xavier Allison, 33, was removing heavy pieces of ductwork during a recent heat wave when his device vibrated. Since he was working with radioactive materials and asbestos, he couldn’t walk outside to rest without going through a decontamination process, so he spent about 15 minutes in a nearby room which was just as hot.

“You just sit by yourself and do your best to cool off,” Allison said.

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The armband notifies workers when they’ve cooled down enough to resume work.

“Ever since we implemented it, we have seen a significant decrease in the number of people who need to get medical attention,” Miller said.

COLLECTING PERSONAL DATA

United Cleanup Oak Ridge uses the sensor data and an annual medical exam to determine work assignments, Miller said. After noticing patterns, the company sent a few employees to see their personal physicians, who found heart issues the employees hadn’t known about, she said.

At Perrigo, managers analyze the data to find people with multiple alerts and speak to them to see if there’s “a reason why they’re not able to work in the environment,” Somers said. The information is organized by identification numbers, not names, when it goes into the company’s software system, he said.

Companies keeping years of medical data raises concerns about privacy and whether bosses may use the information to kick an employee off a health plan or fire them, said Adam Schwartz, privacy litigation director at the Electronic Frontier Foundation.

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“The device could hurt, frankly, because you could raise your hand and say ‘I need a break,’ and the boss could say, ‘No, your heart rate is not elevated, go back to work,’” Schwartz said.

To minimize such risks, employers should allow workers to opt in or out of wearing monitoring devices, only process strictly necessary data and delete the information within 24 hours, he said.

Wearing such devices also may expose workers to unwanted marketing, Ikusei Misaka, a professor at Tokyo’s Musashino University, said.

A PARTIAL SOLUTION

The National Institute for Occupational Safety and Health advises employers to institute a plan to help workers adjust to hot conditions and to train them to recognize signs of heat-related illness and to administer first aid. Wearable devices can be part of efforts to reduce heat stress, but more work needs to be done to determine their accuracy, said Doug Trout, the agency’s medical officer.

The technology also needs to be paired with access to breaks, shade and cool water, since many workers, especially in agriculture, fear retaliation for pausing to cool off or hydrate.

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“If they don’t have water to drink, and the time to do it, it doesn’t mean much,” Juanita Constible, senior advocate at the National Resources Defense Council, said. “It’s just something extra they have to carry when they’re in the hot fields.”

___

Yuri Kageyama in Tokyo contributed to this report.

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Pope Leo says remarks about world being ‘ravaged by a ​handful of tyrants’ were not aimed at Trump: report

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Pope Leo says remarks about world being ‘ravaged by a ​handful of tyrants’ were not aimed at Trump: report

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Pope Leo XIV said Saturday that remarks he made this week in which he said the “world is being ravaged by a handful of tyrants” were not directed at President Donald Trump, a report said. 

The pope, speaking onboard a flight to Angola during his 10-day tour of Africa, said reporting about his comments “has not been ‌accurate in all its aspects” and his speech “was ⁠prepared two weeks ago, well before the president ever commented on myself and on the message of peace that I am promoting,” according to Reuters.

The news outlet cited the pope as saying his comments were not aimed at Trump.

“As it happens, it was looked at as if I was trying to debate the president, which is not in ​my interest at all,” the pope reportedly said.

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’60 MINUTES’ ACCUSED OF USING LEFT-LEANING CARDINALS TO BAIT TRUMP INTO FEUD WITH VATICAN

Pope Leo XIV answers journalists’ questions during his flight from Yaoundé, Cameroon, to Luanda, Angola, Saturday, April 18, 2026. (Luca Zennaro/Pool Photo via AP)

Vice President JD Vance later took to X to thank the pope for clearing the record.

“While the media narrative constantly gins up conflict — and yes, real disagreements have happened and will happen — the reality is often much more complicated,” Vance wrote. “Pope Leo preaches the gospel, as he should, and that will inevitably mean he offers his opinions on the moral issues of the day.

“The President — and the entire administration — work to apply those moral principles in a messy world,” he continued. “He will be in our prayers, and I hope that we’ll be in his.”

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The vice president’s comments came days after he told Fox News’ Bret Baier on “Special Report” that it would be best for the Vatican to “stick to matters of morality.”

“Let the President of the United States stick to dictating American public policy,” Vance said Tuesday.

Trump last Sunday accused Pope Leo XIV of being “terrible” on foreign policy after the pontiff criticized the U.S.-Israeli war on Iran.

“He talks about ‘fear’ of the Trump Administration, but doesn’t mention the FEAR that the Catholic Church, and all other Christian Organizations, had during COVID when they were arresting priests, ministers, and everybody else, for holding Church Services, even when going outside, and being ten and even twenty feet apart,” Trump wrote in a Truth Social post. 

“I don’t want a Pope who thinks it’s OK for Iran to have a Nuclear Weapon.”

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POPE LEO SLAMS THOSE WHO ‘MANIPULATE RELIGION’ FOR MILITARY OR POLITICAL GAIN, TRUMP RESPONDS

Pope Leo XIV and President Donald Trump (Simone Risoluti/Vatican Media via Vatican Pool/Getty Images; Salwan Georges/Bloomberg via Getty Images)

During a speech in Cameroon on Thursday, the pope said, “We must make a decisive change of course — a true conversion — that will lead us in the opposite direction, onto a sustainable path rich in human fraternity.

“The world is being ravaged by a handful of tyrants, yet it is held together by a multitude of supportive brothers and sisters.

Pope Leo XIV speaks as he meets with the community of Bamenda at Saint Joseph’s Cathedral in Bamenda on the fourth day of an 11-day apostolic journey to Africa April 16, 2026. (Alberto Pizzoli/AFP via Getty Images)

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“Woe to those who manipulate religion and the very name of God for their own military, economic or political gain, dragging that which is sacred into darkness and filth.”

Fox News Digital has reached out to the White House for comment. 

Fox News Digital’s Landon Mion contributed to this report. 

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Bulgaria votes in eighth election in five years

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Bulgaria votes in eighth election in five years

Bulgarians headed to the polls Sunday for the eighth time in five years, with anti-corruption candidate and former president Rumen Radev’s bloc tipped to win.

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The European Union’s poorest member has been through a spate of governments since 2021, when large anti-graft rallies brought an end to the conservative government of long-time leader Boyko Borissov.

Eurostat data shows Bulgaria consistently ranks last in the EU by GDP per capita. In 2025, Bulgaria (along with Greece) was at 68% of the EU average.

Radev, who has advocated for renewing ties with Russia and opposes military aid to Ukraine, was president for nine years in the Balkan nation of 6.5 million people.

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He stepped down in January to lead newly formed centre-left grouping Progressive Bulgaria, with opinion polls before Sunday’s vote suggesting the bloc could gain 35% of the vote.

The former air force general has said he wants to rid the country of its “oligarchic governance model”, and backed anti-corruption protests in late 2025 that brought down the latest conservative-backed government.

“I’m voting for change,” Decho Kostadinov, 57, told reporters after casting his ballot at a polling station in the capital, Sofia, adding corrupt politicians “should leave — they should take whatever they’ve stolen and get out of Bulgaria”.

Polls are forecasting a surge in voter participation, with more than 3.3 million Bulgarians expected to cast ballots according to the Bulgarian News Agency.

Voting will close at 1700 GMT, with exit polls expected immediately afterwards. Preliminary results are expected on Monday.

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‘Preserve what we have’

Borissov’s pro-European GERB party is likely to come second, according to opinion polls, with around 20%, ahead of the liberal PP-DB.

“I’m voting to preserve what we have. We are a democratic country, we live well,” said Elena, an accountant of about 60, who did not give her full name, after casting her vote in Sofia.

Front-runner Radev has slammed the EU’s green energy policy, which he considers naive “in a world without rules”.

He also opposes any Bulgarian efforts to send arms to help Ukraine fight back Russia’s 2022 invasion, though he has said he would not use his country’s veto to block Brussels’ decisions.

Pushing for renewed ties with Russia, Radev denounced a 10-year defence agreement between Bulgaria and Ukraine signed last month – drawing fresh accusations from opponents of being too soft on Moscow.

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The ex-president also stoked outrage online for screening images at his final campaign rally of his meetings with world leaders including Russia’s Vladimir Putin.

“We need to close ranks,” he told around 10,000 cheering supporters at the rally, presenting his party as a non-corrupt “alternative to the perverse cartel of old-style parties”.

Borissov, who headed the country virtually uninterrupted for close to a decade, has dismissed suggestions that Radev brings something “new”.

At a rally of his party earlier this week, he insisted GERB had “fulfilled the dreams of the 1990s” with such achievements as the country joining the eurozone this year.

‘No one to vote for’

Radev is aiming for an absolute majority in the 240-seat parliament.

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A lack of trust in politics has affected voter turnout, which slumped to 39% in the last election in 2024.

But with Radev rallying voters, high turnout is expected this time, according to analyst Boryana Dimitrova from the Alpha Research polling institute.

Miglena Boyadjieva, a taxi driver of about 55, said she always votes, but the “problem is that there is no one to vote for”.

“You vote for one person and get others. The system has to change,” she told reporters.

Political parties have called on Bulgarians to show up for the polls, also to curb the impact of vote buying.

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In recent weeks, police have seized more than one million euros in raids against vote buying in stepped-up operations.

They have also detained hundreds of people, including local councillors and mayors.

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How Cheap Drones Are Changing Wars Like the Ones in Ukraine and Iran

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How Cheap Drones Are Changing Wars Like the Ones in Ukraine and Iran

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A 3-D rendering of an Iranian Shahed-136 drone, a device with two triangle-shaped wings attached to a central fuselage. It has an engine the size of a small motorcycle’s and carries 110 pounds of explosives.

Engine the size of a small motorcycle’s

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Carries 110 pounds of explosives

One of the biggest takeaways of the war with Iran is that it has proven itself to be a surprisingly capable adversary against the United States. In addition to its willingness to go on the offensive, Iran has forced the U.S. and its regional allies to confront the rise of cheap drones on the battlefield.

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Iranian drones, made with commercial-grade technology, cost roughly $35,000 to produce. That is a fraction of the cost of the high-tech military interceptors sometimes used to shoot them down.

Note: Estimated price of munitions per unit. In practice, multiple interceptors are fired when targeting a drone. For instance, with the $80 bullet fired by the Centurion Counter-Rocket, Artillery, and Mortar (C-RAM), 75 rounds are fired in a second. Sources: Department of Defense, Lockheed Martin, Northrop Grumman, Open Source Munitions Portal, SRC Inc, U.S. Army and U.S. Navy.

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Cheap drones changed the war in Ukraine, and they have enabled Iranians to exploit a gap in American defense investments, which have historically prioritized accurate but expensive solutions.

Countering drones has been a major priority for the Pentagon for years, according to Michael C. Horowitz, who was a Pentagon official in the Biden administration. “But there has not been the impetus to scale a solution,” he said.

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In just the first six days, the U.S. spent $11.3 billion on the war with Iran. The White House and Pentagon have not provided updated estimates, but the American Enterprise Institute, a conservative-leaning think tank, estimated in early April that the U.S. had spent approximately between $25 and $35 billion on the war, with interceptors driving much of the cost. Many missile defense experts also fear interceptor stockpiles are now running dangerously low.

Here is a breakdown of some of the ways the U.S. and its allies have countered Iran’s drones, and why it can be so costly.

Air-based strikes

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In an ideal scenario, an early warning aircraft spots a drone when it is still several hundred miles out from a target, and a fighter jet, like an F-16, is dispatched from a military base. The F-16 can then use Advanced Precision Kill Weapon System (APKWS) II rockets to shoot a drone from about six miles away.

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A 3-D rendering of an F-16 fighter jet firing an APKWS II rocket from under one wing. Two to three rockets are fired per drone, as per air defense protocol. Two APKWS II rockets and an hour of F-16 flight cost approximately $65,000, a little less than twice that of the Iranian Shahed-136.

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Two to three interceptors fired per drone

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Source: U.S. Navy, Department of Defense

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These types of defensive air patrols are cost-efficient, but haven’t always been available because of the vast scope of the conflict. Iran has also targeted early warning aircraft that the U.S. needs to detect a drone from that distance, according to NBC News.

The other option for detecting and shooting down drones is a variety of different ground-based detection systems, but these systems are all at a disadvantage, as their ability to spot low-flying drones is limited by the curvature of the earth.

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Anti-drone defense systems

One ground-based defense system the U.S. and its allies have built specifically to counter drones at a shorter range is the Coyote. It can intercept drones up to around nine miles away.

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A 3-D rendering of a Coyote Block 2 interceptor, which looks like a three-foot tube with small rockets at one end. Two Coyotes cost approximately $253,000 or about seven times that of the Iranian Shahed-136.

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The Coyote is significantly cheaper than many of the other ground-based defense systems available to the U.S. and its allies and historically effective at defending important assets. But despite being both effective and cost-efficient, relatively few Coyotes have been procured by the U.S. military in recent years.

When Iran-backed militias launched attacks on U.S. ground troops in the region in 2023 and 2024, there were so few Coyotes available that troops had to shuffle the systems between eight different bases in the region almost daily, according to a report from the Center for a New American Security, a Washington think tank.

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Ship-based anti-missile defenses

Many of the longer-range ground-based defense systems the U.S. and its allies can use to combat drones are more expensive, as they are designed to shoot down aircraft and ballistic missiles, not drones. A Navy destroyer’s built-in radar system, for instance, can detect drones from 30 miles away and shoot it down with Standard Missile 2 (SM-2) interceptors. As in the air-based strikes, military protocol stipulates that at least two missiles be fired.

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A 3-D rendering of the deck of a Navy destroyer firing an SM-2 missile from a built-in launcher, which looks like a 15-foot missile launching from a grid of openings on the ship’s surface. Two SM-2 missiles cost approximately $4.2 million, about 120 times that of the Iranian Shahed-136.

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This misalignment between America’s defense systems and current warfighting tactics started after the Cold War, when the anticipated threats were fewer, faster, higher-end projectiles, not mass drone raids.

Iran often launches multiple Shahed-136 drones at a time, given their low price tag. The drones are also programmed with a destination before launch and can travel roughly 1,500 miles, putting targets all across the Middle East within reach.

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“This category of lower-cost precision strike just didn’t exist at the time that most American air defenses were developed,” said Mr. Horowitz.

Ground-based anti-missile defenses

The Army’s standard air-defense system is the Patriot. Typically stationed at a military base, it can shoot down a drone from up to around 27 miles away with PAC-3 Missile Segment Enhancement interceptors. Military protocol stipulates that at least two missiles be fired.

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A 3-D rendering of a Patriot launcher loaded with 17-foot PAC-3 MSE missiles, which looks like a tilted shipping container with scaffolding. Two PAC-3 MSE missiles cost approximately $8 million, about 220 times that of the Iranian Shahed-136.

Patriot missile defense system

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Air defense training teaches service members to prioritize using longer-range defense systems first to “get as many bites at the apple as you can,” but those are the most expensive, said Stacie Pettyjohn, a senior fellow and director of the defense program at the Center for a New American Security.

But a costly defense can still make economic sense to protect a valuable target, especially those that are difficult to repair or replace, such as the nearly $1.1 billion radar at a military base in Qatar and the $500 million air defense sensor at a base in Jordan that were damaged early in the conflict.

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Ground-based guns

Finally, there is what one might call a last resort: a ground-based gun. When a drone is about a mile away or less than a minute from hitting its target, something like the Centurion C-RAM can begin rapidly firing to take down the drone.

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A 3-D rendering of a Centurion C-RAM, which looks like a gun mounted to a rotating, cylindrical stand. The gun fires 75 rounds of ammunition per second. Five seconds of firing the gun costs $30,000, slightly less than a single Iranian Shahed-136.

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Centurion Counter-Rocket, Artillery and Mortar

Fires 375 rounds of ammunition in 5 seconds

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Even though it is fairly cost-effective, the Centurion C-RAM is not the best option because it has such a short range.

Interceptor drones

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There’s also what one might call the future of fighting drones: A.I.-powered interceptor drones. Interceptor drones like the Merops Surveyor can theoretically hunt and take down enemy projectiles from a short range.

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A 3-D rendering of a Surveyor drone, which looks like a three-foot tube with wings and a tail. The Merops drone costs approximately $30,000, a little less than a single Iranian Shahed-136.

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Merops system: Surveyor drone

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Eric Schmidt, the former Google chief executive, founded a company to develop the Merops counter-drone system in conjunction with Ukrainian fighters, who have already been combatting Iranian drones in the war with Russia for years.

The U.S. sent thousands of Merops units to the Middle East after the conflict began, but it is unclear whether they have been deployed. The military set up training on the system in the middle of the war, as reported by Business Insider.

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Other attempts to lower the cost-per-shot ratio of taking out a drone have failed.

The Pentagon invested over a billion dollars in fiscal year 2024 researching directed energy weapons, or lasers, that would cost only $3 per shot and have a range of 12 miles. Those systems have yet to be used in the field.

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Despite the cost imbalance, the real fear for many in the defense community is the depleted stockpile of munitions.

“What scares me is that we will run out of these things,” said Tom Karako, the director of the Missile Defense Project at the Center for Strategic and International Studies in Washington. “Not that we can’t afford them, but that we’ll run out before we can replace them.”

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