Yesterday's surprise leak of the source code for Anthropic's Claude Code revealed a lot about the vibe-coding scaffolding the company has built around its proprietary Claude model. But observers digging through over 512,000 lines of code across more than 2,000 files have also discovered references to disabled, hidden, or inactive features that provide a peek into the potential roadmap for future features.

Chief among these features is Kairos , a persistent daemon that can operate in the background even when the Claude Code terminal window is closed. The system would use periodic "<tick>" prompts to regularly review whether new actions are needed and a "PROACTIVE" flag for "surfacing something the user hasn't asked for and needs to see now."

Kairos makes use of a file-based "memory system" designed to allow for persistent operation across user sessions. A prompt hidden behind a disabled "KAIROS" flag in the code explains that the system is designed to "have a complete picture of who the user is, how they'd like to collaborate with you, what behaviors to avoid or repeat, and the context behind the work the user gives you."

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It’s a regrettable reality that there is never enough time to cover all the interesting scientific stories we come across. So every month, we highlight a handful of the best stories that nearly slipped through the cracks. March's list includes puzzle-solving raccoons; the physics of folding a crepe; the rediscovery of a lost page from an Archimedes manuscript; and the 2026 winner of the annual Dance Your PhD contest, among other highlights.

Puzzle-solving raccoons

Credit: Hannah Griebling/CC BY

Raccoons (aka "trash pandas") are notorious pests in urban and suburban settings because of their penchant for rooting around trash and compost bins; even latches and other safeguards can't entirely keep them at bay. It might be more than food searching behavior, scientists at the University of British Columbia concluded. According to their paper published in the journal Animal Behavior, raccoons are not only nimble and dextrous with their paws, they also excel at solving puzzles, which might be why they thrive so well in human-centric environments.

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On March 27, the White House announced a “powerful new official mobile app,” calling it “the fastest, most powerful way to stay informed and engaged with the Trump Administration.”

While armchair developers and infosec experts have questioned some of the app’s technical design choices, a former FBI special agent uncovered an unusual fact: The small business owner behind the White House app has a side hobby as a conspiracy theorist.

The White House app was created by 45Press , a company based in Canfield, Ohio, a town of fewer than 8,000 people located roughly halfway between Cleveland and Pittsburgh. (Donald Trump was the 45th president of the United States.) The company’s website describes it as a “design, development, and DevOps agency” and a WordPress VIP Agency Partner; it lists Amazon, NBC, and Sony as past clients.

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Last month, Swiss Finance Minister Karin Keller-Sutter filed a criminal complaint over an offensive Grok post generated by an X user that requested that the chatbot "roast" the government official.

According to Bloomberg , Keller-Sutter's complaint seeks to hold the X user accountable for defamation and verbal abuse. She also "asked the prosecutor to assess whether X also bears responsibility" for failing to block Grok's misogynistic and "vulgar" outputs.

The finance ministry described the Grok output as "blatant denigration of a woman," Bloomberg reported, while emphasizing that "such misogyny must not be seen as normal or acceptable."

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Elon Musk’s rocket company SpaceX has confidentially filed to go public, firing the starting gun on what is expected to be the biggest initial public offering in history.

The Texas-headquartered company had this week filed paperwork with the Securities and Exchange Commission for the listing, according to two people familiar with the matter.

Confidential filings allow companies to advance their listing plans without publicly revealing their financials. SpaceX last month acquired Musk’s lossmaking AI start-up xAI for $250 billion.

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A federal judge ruled that President Trump's executive order defunding NPR and PBS violated the First Amendment and issued a permanent injunction stating that executive branch agencies cannot enforce it.

The Trump order's "instruction that all federal agencies stop funding NPR and PBS constitutes a penalty for engaging in speech disfavored by the President and cannot be lawfully implemented by any executive department or agency," Judge Randolph Moss, an Obama appointee in US District Court for the District of Columbia, ruled yesterday .

The ruling against Trump in the case filed by NPR, PBS, and several stations may not have much practical impact. Trump's May 2025 executive order was followed by Congress rescinding the entire Corporation for Public Broadcasting (CPB) budget of $1.1 billion for fiscal years 2026 and 2027.

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Hello! Is Moonshark. Moonshark say, long time since Moonshark have front page article but Moonshark believe is overdue if Moonshark does say so Moonshark self.

Moonshark is shark from Moon, and Moon have important event come soon: is visit by astronauts from Earth for first time since before Moonshark born! Moonshark excited say hello! Hello Earth astronauts!

Moon is best

Moonshark remember stories from Old Grandpa Moonshark about other times astronaut come visit Moon. Grandpa Moonshark ramble a lot, but also got autograph from Pete Conrad. Grandpa Moonshark say Pete Conrad definitely funniest astronaut come Moon. But Moonshark also hear Artemis II astronaut Victor Glover very funny too, so maybe Moonshark meet Victor and get one up on Old Grandpa Moonshark, make Old Grandpa Moonshark jealous!

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Today marks a refreshing change from the doom and gloom we've seen in the EV industry over the last few weeks.

New York is holding its annual auto show, and while these events don't hold as much relevance for the media as they did a decade ago, Kia is keeping the spirit alive, this morning debuting a couple of new vehicles for model year 2027 that we think hit the current mood. These are not ginormous three-rows. They're not even mid-sized SUVs. People have been asking for small cars, and it seems at least Kia has heard the message with the 2027 EV3 and a new Seltos, which will now offer a hybrid option.

EV3

We got our first look at the EV more than two years ago, together with the EV4 sedan. Despite our drive of the latter last year , the EV4's US launch was shelved. That's not true for the EV3, which sticks with more popular SUV styling that mimics the bigger EV9. Ars drove the EV3 briefly in 2025, too— check out Kristin Shaw's early drive impressions to learn more about how it handled.

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Many of the early exoplanet discoveries were exciting on their own, confirming that there really were strange new worlds out in the Universe. But over time, our focus has shifted more toward numbers, as we began using the frequency of objects like super-Earths and mini-Neptunes to learn more about how planets form. With four gravitational wave detectors now having generated years of data, we may be on the verge of seeing something similar happen with black hole mergers.

On Wednesday, researchers released an analysis suggesting that there's a "mass gap" in the population of black holes that we've detected so far. And that gap supports the idea that some stars are so massive that they die in something called a pair-instability supernova, which is so violent that it leaves nothing but debris behind.

That's not stable

Black holes result from the collapse of a star's core during a supernova. While the outer layers of a star explode outward, the innermost layers plunge inward, funneling a fraction of the star's mass into the black hole (or neutron star if the star's mass is too small). We're not sure what the upper limit on a star's mass is, so you might naively think the distribution of black hole masses tails off gently.

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