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One Fluid, Three Scales

Fluid physics works because scientists can describe the same liquid or gas at radically different levels. At the microscopic scale, Newton’s laws track particles as they move and collide. At the mesoscopic scale, the Boltzmann equation replaces that impossible particle-by-particle accounting with the statistical behavior of a typical particle. At the macroscopic scale, the Euler and Navier-Stokes equations treat the fluid as a continuous substance, allowing engineers and scientists to model everything from airflow over a wing to weather systems.

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Techmeme surfaced Lily Hay Newman’s WIRED report, “OpenAI Launches Full-Scale Effort to Patch Open-Source Bugs as It Takes on Anthropic’s Mythos”, published June 22. The story captures a practical shift in AI security: frontier models are making vulnerability discovery cheap enough that finding bugs is no longer necessarily the hardest part. The new constraint is the human and organizational work required to validate reports, decide what matters, write acceptable fixes, test them, and coordinate disclosure.

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This summary covers The Economist’s June 13th, 2026 Science & technology column listed in the contents as Well Informed: Anti-ageing balms and published under the headline The chemicals that reduce wrinkles.

The crowded market for anti-ageing skin products borrows heavily from biochemistry, advertising ingredients such as retinoids, antioxidants, peptides and exfoliating acids. Much of the supporting evidence, however, comes from company-funded studies or consumer surveys. Only a smaller group of ingredients has convincing scientific backing, and even those can reduce some visible signs of ageing rather than stop the process.

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Lebanese turtle conservationist Mona Khalil killed by Israeli strike (r/news)

• invasiveplant: Poor woman. Sounds like she was a real source of straight-up uncomplicated good in the world
• 526mb: It’s sucks that decades of conservation efforts in one of the toughest places to be a conservationist may be overshadowed by the tragic circumstances of Khalil’s death. What an incredible legacy to leave behind.
• amy-schumer-tampon: They are speed running international hatred.

After deadly protests, more Iranian women choosing to defy hijab law despite the dangers (r/news)

• LameAfro: Imagine getting triggered over Womens hair. Biggest cry baby Goverment of all time 😂
• PlankownerCVN75: Fucking good for them, man.
• mynameisnotnemo: I want yall to understand that Iranian women have very thick skin and they don’t give a flying fu** about this law. My mom’s friend is a teacher in Shiraz and she goes to work without her roosari (hijab) and no one cares. Even the police around her in the school don’t press. I was just in Shiraz late last year and there’s a famous walking trail called piyadeh ra salamat. I walked here often and I saw women both with or without hijab and nothong was abnormal about this. It feels like a law which is still the written “law” but it’s not being enforced how outsiders may think at all. If the government attempts to crack down on those opposing this law, it will fail.

Kentucky Attorney General sues prediction market, online casino companies (r/news)

• TheKingPooPoo: Someone must not be getting their slice of the pie
• Not_a_Rodeo_Clown: My guess is I don’t agree with this guy on pretty much anything, and I would not be surprised if his motive here is purely financial, but I will still applaud anyone taking on prediction markets.
• ImTooSaxy: We’re making a nation of gambling addicts, starting with kids buying “mystery box” toys as well as in video games. It used to be that you could only gamble in Las Vegas and Atlantic City, and maybe at the bingo hall at church. America has gotten real weird, real quick.

Pharmacists of Reddit - what recent medication trends are worrying you that aren’t being talked about? (r/AskReddit)

• Empty_Ad4954: I work in a large teaching hospital. We see lots of patients on GLP-1s with pancreatitis or recurrent bilious emesis. When they’re discharged they’re told to speak to the original prescriber about whether or not to continue the GLP-1. Which of course does not happen every time
• iamellenphant: Absolutely the GLP-1s. These are serious medications with potential for serious side effects (as another commenter pointed out with pancreatitis, I’ve also seen gastroparesis requiring surgical involvement). The fact there’s now so many of these unvetted companies willing to prescribe the plethora that’s out there with minimal supervision makes my skin crawl.
• AMH1028: Hi, actual pharmacist. I am worried about the vast number of over the counter ”natural supplements” that actually contain unregulated prescription medication. For example, gas station “stamina” pills that have sildenafil, a med that requires a prescription. Even stimulants are found in these supplements it’s crazy.

What’s so expensive that it’s not even fun anymore? (r/AskReddit)

• free_hug21: Concerts. I used to think the hard part was getting tickets. Now the hard part is convincing myself one night is worth half a paycheck.
• Myitchychocolatestar: Bowling!
• jillyymariee: Movie theaters. What do you mean a popcorn is more than my already expensive movie ticket?

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Amazon VP argues humans are too inconsistent to oversee AI agents (Blind)

• ShitFarce (Salesforce): First humans were needed in the loop because they feared the backlash. Now its too much of a risk because fuck humans. I bet that VP can be easily replaced by an agent
• 小熊维尼 (Palo Alto Networks): Of course a dumbass at Amazon would say this
• XpBs23 (Meta): Leaders think they have intuition to make the right decision, 95% of the time it’s just luck

Techies: Where do you guys plan on retiring to? (Blind)

• DoesntWork (Justworks): Some place where I can’t be taxed. Some place where the US has 0 control. I think the Strait of Hormuz would be excellent.
• geffler (Microsoft): Everyone seems to talk about expat and moving to SE Asia but reality is everyone stays in USA
• hyX774J (Google): Taiwan and Andorra are the only countries with same-sex marriage and no extradition treaty with the US

Morale is so bad at Mark Zuckerberg’s Meta even the company’s own CTO admits it’s ‘probably the worst it’s ever been’ (r/technology)

• Prudent_Link6029: Virtual pizza in the metaverse should boost morale
• casualfrog68: The firings will continue until the morale improves.
• hmmm_: Every company I’ve ever been at, once employees feel they are disposable it’s over. You don’t easily recover. It corrodes individual performance, it gets team fighting each other, good people start to leave. It’s an insidious change in the way a company feels and the negative effect accumulates over time - usually CEO/CFOs have the good sense to move on so the new CEO gets blamed for the decrease in company performance.

Ukraine launches TrophyLab platform to share captured Russian weapons’ technology with allies — “Every missile, drone, and vehicle seized on the battlefield is now a source of knowledge for the free world” (r/technology)

• LifeFeckinBrilliant: Any Chinese or Iranian stuff I wonder…
• NeonFraction: They’re about to make some military nerds VERY happy.
• Puzzled-Hedgehog4984: The reverse-engineering pipeline has been running since 2022 — this just makes the output shareable at scale. What’s underrated here isn’t the captured hardware, it’s the institutional knowledge Ukraine is building about exactly where Russian supply chain quality breaks down. That catalog has value well beyond this war.

Nvidia’s CEO Jensen Huang says electricians and plumbers will be needed by the hundreds of thousands in the new working world (r/technology)

• asdf_lord: So like, less than what’s currently employed????
• pharmloverpharmlover: “We need cheap humans to feed the machines that feed my bank account”
• C_Pala: The new " just learn to code, bro" just dropped

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Quick facts

• Difficulty: MEDIUM
• Problem: Clone Graph
• Topics: Hash Table, Depth-First Search, Breadth-First Search, Graph Theory

Problem gist

The input is a reference to one node in a connected, undirected graph. Each node stores a value and a list of neighboring nodes. The goal is to return a deep copy of the entire graph: every original node must have a newly created counterpart, and every edge must connect the corresponding copied nodes.

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A Clock inside the Nucleus

Modern atomic clocks are already astonishingly stable: the best lose only about one second every 100 million years. Yet they still rely on electrons in an atom’s outer regions, where stray electric and magnetic fields can disturb the measurement. Physicists have long wanted to move the clock’s reference point into the much smaller, denser, and better-shielded atomic nucleus.

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Techmeme surfaced the Wall Street Journal investigation They Looked Like They Were Getting Rich on Polymarket—but None of It Was Real, published June 21. The article examines how a product built around publicly observable wagers marketed itself through videos of trades that never happened.

The Journal reviewed more than 1,100 videos, creator instructions, and interviews with people who worked in Polymarket’s paid content program. It found dozens of mostly college-age creators filming staged trades and, in some cases, fabricated wins. The videos looked like personal accounts of successful betting, but the activity shown did not correspond to transactions on Polymarket’s actual market.

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This summary covers The Economist’s June 13th, 2026 Science & technology article listed in the contents as Blind spot on Chinese science and published under the headline Doctors with borders.

China has become a scientific superpower, producing as many papers in 2025 as America, Britain, Germany and Japan combined. Yet Western researchers often fail to cite Chinese work. The gap is not easily dismissed as a difference in quality: China also leads the Nature Index, which tracks output in a group of respected journals.

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Flu outbreak among Air Force recruits at Joint Base San Antonio after Hegseth ends mandatory flu vaccine (r/news)

• Nacolo: It sucks but it’s also not unexpected.
• ParadoxicalIrony99: Coincidence but not likely related. The flu vaccine of late is usually not effective against the main virus causing strain, so this outbreak likely happens flu shot or not.
• Leprechaunaissance: Make America Sick Again.

US Supreme Court sides with marijuana user stripped of gun rights (r/news)

• Temporary-Degree5221: Great news. Just like how mentally unstable people shouldn’t hold guns
• halander1: Imagine getting 9-0’ in the Supreme Court
• Then-Potato-2020: alchohol users - hold my beer

Beef prices rise as U.S. cattle herd falls to lowest level in 75 years (r/news)

• hamockin: OK, it’s time to say it. Trump is a secret Environmentalist. raising the prices of beef and all the stupid crap we’re purchasing.
• Mercuryqueen71: I picked a good time to stop eating meat and at the moment I don’t miss it at all.
• midnightprism: Lentil burgers it is then 😩

Mexico cuts workweek, bans after-hours contact, and guarantees no worker will take a pay cut in the most sweeping labor reform in a generation (r/news)

• WifesPOSH: What about the rich people? How are they affected? Why does no one think of the wealthy?
• PrometheusMMIV: How can they guarantee people won’t get a pay cut? Does it prevent them from holding back raises until your pay is in line with market value? Does it prevent them from firing someone and hiring someone else that’s cheaper? This might be a temporary stopgap, but in a few years, the market will readjust and people will most likely be earning less per week than they were before.
• willzyx01: For all the anti-American comments on how Americans can’t read, sure looks like nobody here knows how to read past the headline either.

What’s something that was considered good parenting decades ago but isn’t anymore? (r/AskReddit)

• DoraMuda: Corporal punishment.
• LateralThinkerer: Walking to school - the whole milk-carton kidnapped children gambit sold a lot of political paranoia and SUVs though.
• alovelyweed: Consoling upset babies and toddlers in moving vehicles by holding them. Car safety standards have changed a lot over the decades.