Though shredded iceberg lettuce at Taco Bell restaurants has been a prime suspect in an explosive outbreak of the diarrheal parasite Cyclospora , a new report from the Food and Drug Administration finally reveals where all the contaminated lettuce was sold—and only a tiny sliver of it went to Taco Bell locations.

The feces-tainted lettuce was sourced from Mexico and sold by Taylor Farms, a mammoth produce provider based in California. Taylor Farms has drawn scrutiny for its ties to the Trump administration and reluctance to provide information amid the outbreak, which has now sickened over 23,000 people across 47 states, killing two and sending over 500 others to the hospital. Taylor Farms reportedly attempted to delay issuing a recall amid the illnesses and, since then, has refused to clearly report how much tainted lettuce it recalled and where all of it had been shipped.

The FDA's Enforcement Report finally provides some answers: Taylor Farms recalled a total of 236,192 cases of lettuce due to potential Cyclospora contamination. Of those, only 5,900—just shy of 2.5 percent—were sold to Yum, the parent company of Taco Bell, Pizza Hut, and KFC. The other 97.5 percent of the lettuce that potentially sickened Americans was distributed elsewhere.

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Global warming is leading to more extremely hot weather. There is perhaps no more obvious consequence of climate change. But changing how we analyze this problem can still help scientists think about it in a different way that may yield surprises.

Generally, studies on heat extremes work with some combination of daily minimum, maximum, and mean temperatures. Sometimes they focus on multi-day heatwaves using those metrics, since the discomfort and health impacts increase for longer events. There are different thresholds you can use to define extreme heat in these analyses, either based on past statistics or on the human body’s physiological limits.

A new study led by Weilin Liao and Xuanzong Zhang at Sun Yat-sen University tried breaking down heat extremes to the hourly level instead, which reveals some interesting nuances.

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In 2018, 20,000 Google employees worldwide made headlines when they staged a walkout to protest how the company had handled sexual misconduct allegations against key corporate executives, among other grievances. One of the organizers was Claire Stapleton , a communications specialist whose distinctive voice and ability to channel the corporate ethos had once earned her the internal moniker "Bard of Google."

Six months later, a disillusioned Stapleton resigned, claiming she had been demoted during the most recent restructuring as retaliation for helping to spearhead the walkout. The story of how she went from enthusiastic cheerleader to proactive dissident, and the many lessons she learned along the way, are featured in her new book, Don't Be Evil: Bad Bosses, Fake Promises, and My Escape from Big Tech—A Biting Memoir of Twelve Years Inside Google .

Stapleton didn't set out to be a rabble-rouser. When she joined Google out of college in 2007, it was like "getting the golden ticket in Willy Wonka ," she told Ars. Awareness of her good fortune offset any initial uneasiness or skepticism, although Stapleton was sufficiently independent-minded not to move into what was then Google's new corporate housing development in Mountain View, California. Stapleton was very good at her job, and she quickly moved up the ranks, playing a key role in shaping the company's public image.

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The Federal Communications Commission has been shorthanded throughout President Trump's second term, but it's about to get a new commissioner. Unsurprisingly, Trump is breaking a historical norm with a nomination that would give Republicans a 3-1 advantage on the FCC.

Historically, the president and Senate worked together to ensure that the president's party maintained only a one-vote majority. Normally, the president's party has three FCC members while the minority party has two.

Instead of the typical 3-2 split, the FCC has operated with a 2-1 Republican majority during Trump's second term. On Friday, Trump nominated Republican Danielle Thumann Severs to take one of the empty spots. Thumann Severs, a lawyer, has been working as FCC Chairman Brendan Carr's senior counsel. She must be confirmed by the Republican-controlled Senate before being sworn in as a commissioner.

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Imagine that you share a ride to work with the same colleague most mornings. As it passes by a license plate reader, the camera records the car, which can be linked through vehicle records to its registered owner. Beside it, another sensor detects signals broadcast by devices traveling nearby, such as your phone and your colleague’s smartwatch.

After enough trips, software may treat some of those devices as a recurring electronic signature associated with the vehicle. Weeks later, one of the same device signals appears alongside a different car connected to an investigation. The signal itself may not contain its owner’s name, but its previous association with a known vehicle gives investigators another clue they can use to work out who was carrying the device.

SignalTrace , a system marketed by the security company Leonardo , is designed to work alongside automatic license plate readers. The company says it can recognize groups of consumer devices that regularly move together, then associate them with license plate records and time-stamped locations. The pattern can then be searched even when a police investigator does not know the plate number.

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Last week a researcher outlined what he said was a “novel attack surface” in passkeys, the new authentication paradigm that offers a more secure alternative over password-based methods. In fact, the attacks demonstrated in the post are neither novel nor unique to passkeys. This distinction is important because the research has generated confusion among end users and security professionals as they assess whether this new mechanism is truly safe to use.

The attack is called Pass-ta-key—a blending of the word passkey with the phrase “pass the key” and a nod to a plate of pasta. Arie Olshtein, a researcher at security firm Palo Alto Networks, described in a post last week how Pass-ta-key could obtain all passkeys stored in the Google Password Manager app (GPM) for Windows when it’s running on a machine infected with malware.

This came as a surprise to many people because they believed passkeys are stored exclusively in the trusted platform manager (TPM), the locked-down enclave in a hardened silicon chip that’s reserved for storing cryptographic keys and other highly sensitive information on Windows machines. If passkeys are stored in the TPM, then how was Pass-ta-key able to extract the entire set of passkeys stored by the app, they wanted to know?

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By now, any serious gamer is familiar with a favorite title becoming unplayable after a centralized online server gets shut down, or being unable to purchase and download a digitally delisted, critically acclaimed title from yesteryear. Can anything be done about this video game preservation problem?

To help answer that question, we'll be hosting a live conversation with Ross Scott , the founder of the Stop Killing Games campaign , on August 11 at 2:30 pm ET as part of the Ars Live series. As Ars' Senior Gaming Editor, I've documented countless examples of once vibrant games being left for dead by their creators.

You can watch the discussion live on YouTube when the time comes.

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Meta has announced its intention to focus on open-weight large language models. Additionally, the company announced the release of an open model called Muse Glimmer and a promise to open the weights for Muse Spark 1.2, its more powerful model, in the next few weeks.

Alongside these announcements, Meta CEO Mark Zuckerberg published a more than 6,000-word essay outlining the company's philosophy about AI systems and governance moving forward. The essay aims to differentiate Meta from companies like OpenAI and Anthropic, which develop proprietary models and which have lobbied the US government for help competing against large-scale distillation—which involves using an existing model to train a new one—or open-weight models by Chinese labs.

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President Trump signed an executive order Monday that makes sweeping, unilateral changes to federal vaccine recommendations. The order aims to reduce the number of lifesaving vaccines all children are recommended to get—from 18 to 11—while also splitting them up and spacing them out over more time and more medical visits.

The vaccine changes are not backed by evidence or spurred by new findings. Rather, they are based on false anti-vaccine fearmongering about harms, including the debunked claim that they cause autism, and misinformation that multiple vaccinations can "overwhelm" children's immune systems. This false claim has also been repeatedly debunked and explained .

During a signing event at the White House on Monday afternoon, Trump falsely claimed that pediatricians "have a vaccination that looks like the size of a bottle of soda," that is "poured into a little child's body, and bad things happen in too many cases. This is an explosion; this is an epidemic," Trump said.

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