Residents of Birmingham, Alabama, were abruptly informed earlier this month that their water utility had decided to stop adding fluoride to city water. Then, days later, they learned that the utility had actually stopped adding fluoride years ago.

On March 20, Central Alabama Water (CAW) made an announcement that it had discontinued water fluoridation. The announcement cited "aging equipment" and "increasing maintenance and component replacement" as justifications for the removal of fluoride, which it indicated had already occurred. But the water utility also highlighted unsubstantiated health concerns and noted that people can buy toothpaste and mouthwash that contain fluoride to protect their teeth.

Emphasizing that there are "questions about the long‑term health effects," CAW said, "ending drinking water fluoridation allows customers and their health care providers to make more individualized decisions about fluoride use."

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Although the Trump administration approved Nexstar Media Group’s $6.2 billion purchase of Tegna, a US judge has ordered the two companies to stop integrating their assets and operations. US District Judge Troy Nunley, an Obama appointee, issued a temporary restraining order on Friday prohibiting integration of the companies until further rulings by the court.

"Defendants must immediately cease all ongoing actions relating to integration and consolidation of Nexstar and Tegna," wrote Nunley, the chief judge in US District Court for the Eastern District of California.

Nunley said he agrees with plaintiff DirecTV that immediate integration of the merging firms could eliminate competition, result in newsroom layoffs and shutdowns, and make it more difficult to divest Tegna stations if the court ends up requiring a divestiture after reviewing the merger. DirecTV has established that "the Nexstar-TEGNA merger will substantially lessen competition in markets in which it participates," and that there would be irreparable harm if a restraining order isn't issued, Nunley wrote.

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Polymarket’s temporary makeover of a K Street bar as “The Situation Room” yielded a few notable differences from other Washington watering holes: more laptops open, more overheard conversations about cryptocurrency, and more screens—most of which were not showing sports.

The New York-based prediction market announced in a March 18 thread on X that it was opening what it called “the world's first bar dedicated to monitoring the situation,” touting the availability of “live X feeds, flight radar, Bloomberg terminals, and Polymarket screens.” The bar would only be there for a three-day run.

The reality—as reported by journalists who showed up for a press-preview event Friday night—fell vastly short of that, with power and Wi-Fi problems that left all the displays dark . Polymarket fixed the screens the next day, however, and on my own visit on Sunday afternoon, dozens of displays offered a choice of CNN, CBS, the local Fox station, FS1, and various pages on Polymarket’s site. No normal bar would have CNBC or C-SPAN on, but those networks were a logical fit for this one.

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When George W. Maschke applied to work for the FBI in 1994, he had already held a security clearance for over 11 years. The government had deemed him trustworthy through his career in the Army. But soon, a machine and a man would not come to the same conclusion.

His application to be a special agent had passed initial muster. And so, in the spring of 1995, according to his account, he found himself sitting across from an FBI polygraph examiner, answering questions about his life and loyalties.

He told the truth, he said in an interview with Undark. But in a blog post on his website, he recalled the examiner told him that the polygraph machine—which measured some of Maschke’s physiological responses—indicated that he was being deceptive about keeping classified information secret, and about his contacts with foreign intelligence agencies.

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Three-hundred million years ago, the skies of the late Palaeozoic era were buzzing with giant insects. Meganeuropsis permiana , a predatory insect resembling a modern-day dragonfly, had a wingspan of over 70 centimeters and weighed 100 grams. Biologists looked at these ancient behemoths and asked why bugs aren’t this big anymore. Thirty years ago, they came up with an answer known as the "oxygen constrain hypothesis."

For decades, we thought that any dragonflies the size of hawks needed highly oxygenated air to survive because insect breathing systems are less efficient than those of mammals, birds, or reptiles. As atmospheric oxygen levels dropped, there wasn’t enough to support giant bugs anymore. “It’s a simple, elegant explanation,” said Edward Snelling, a professor of veterinary science at the University of Pretoria. “But it’s wrong.”

Insect breathing

Unlike mammals, insects don't have a centralized pair of lungs and a closed circulatory system that delivers oxygen-rich blood to their tissues. “They breathe through internalized tubing called the tracheal system,” Snelling explained.

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Over a decade ago, when I was first starting to pretend I could write about quantum mechanics, I covered a truly bizarre experiment . One half of a pair of entangled photons was sent through a device it could navigate as either a particle or a wave. After it was clear of the device, the other half of the pair was measured in a way that forced the first to act as one or the other. Once that was done, the first invariably behaved as if it were whatever the measurement made it into the whole time.

It was as if the measurement had reached backward in time to alter the photon's behavior, raising questions about whether causality itself actually applied to quantum mechanics.

Unbeknownst to me, physicists have been asking the same question and have designed experiments to probe it in detail. A few weeks back, they provided an experiment that seems to indicate it's possible to create quantum superpositions of two different series of events, essentially making the question of whether A or B happened first a matter of probability*. While the current experiment leaves a few loopholes, the researchers behind the work think they could ultimately be eliminated.

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Our oceans are full of sophisticated, perfect traps: Nets, hooks, fishing lines. Designed to capture animals destined for our dinner tables, they often catch other wildlife too.

This accidental harvest is known as bycatch, and every year it causes the death of millions of marine animals , including whales, dolphins, sharks, turtles, and seabirds. Nets and gear can asphyxiate animals or cause fatal injuries; even when the animals are tossed back to sea, they frequently die. Bycatch is also a dilemma for fishermen—entangled creatures can destroy equipment, costing time, money, and fisheries’ reputations.

Over the decades, conservationists, researchers, and fishermen have developed ways to minimize various kinds of bycatch in different fishing stocks around the world. But putting these solutions to work is often a challenge, and many mitigation strategies are never widely implemented.

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Like practically everyone who owned a PC in the early '90s, I tore through the shareware episode of Wolfenstein 3D shortly after it came out. At the time, the game’s mere existence seemed like a magic trick, offering a smooth-scrolling first-person perspective that was unlike pretty much anything I had ever seen. Strictly speaking, the game might have been ironically two-dimensional (lacking even the simulated gameplay “height” of follow-up Doom ), but the sense of depth conveyed by the viewpoint was simply mind-blowing.

Coming back to Wolfenstein 3D in 2026 feels quite a bit different. The initial magic trick of the game’s perspective has worn off after nearly 35 years of playing the countless first-person shooters it inspired. And the advancements in shooter design since 1992 make some of the decisions id Software made for its first experiment in the genre feel a bit archaic from a modern perspective.

Still, it’s fascinating to look back at Wolfenstein 3D today and see the seeds that would sprout into one of gaming’s most popular genres. Playing it today feels like going to a car museum and taking a Model T for a spin, with all the confusion and danger that entails.

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OpenAI has added plugin support to its agentic coding app Codex in an apparent attempt to match similar features offered by competitors Anthropic (in Claude Code) and Google (in Gemini's command line interface).

What OpenAI calls "plugins" are actually bundles that may include skills ("prompts that describe workflows to Codex"—a standard feature in tools like this these days), app integrations, and MCP (Model Context Protocol) servers.

The idea is that they make it possible to configure Codex in certain ways for specific tasks to be easier for the user and replicable across multiple users in an organization.

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