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What this article is about

This article turns one of special relativity’s strangest visual predictions into something researchers could finally see in the lab. The subject is the Terrell-Penrose effect, a result that sounds wrong the first time it is described: an object moving close to the speed of light should not simply look squashed in the direction of motion, even though relativity says its length is contracted. To an observer, it should instead look rotated.

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Selected problem: API Rate Limiter

Scope: Design a distributed server-side rate limiter that enforces per-user, per-IP, per-tenant, and per-route API quotas with very low decision latency across many stateless services.

Problem framing

This is the classic server-side API rate limiter from Grokking and Alex Xu: every request should get a cheap admission decision before it reaches expensive application logic.

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Selected problem: Distributed Cache

Scope: Design a distributed in-memory cache service that provides very low-latency GET/SET/DELETE/INCR operations with TTLs, eviction, sharding, and failover for many stateless application services.

Problem framing

This is the classic “design Memcache / Redis-class cache” interview problem: build a shared cache tier that is much faster than the system of record, scales horizontally, and fails gracefully instead of turning into a new bottleneck.

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Selected problem: Notification System

Scope: Design a soft real-time notification platform that accepts events from internal services, renders user-facing messages, respects user preferences, and dispatches push, email, SMS, and in-app notifications reliably at large scale.

Also see https://wiki.derricklin.net/software-development/System%20Design%20Interview/#notification-system

Problem framing

This is the classic “design a notification system” interview problem: build the shared infrastructure that product teams use whenever they need to notify users about security alerts, messages, payments, delivery updates, marketing campaigns, or feed changes. The core challenge is not just calling APNs, FCM, an SMS gateway, or an email provider. The harder parts are durable intake, preference filtering, fanout, queue isolation, retries, deduplication, rate limiting, observability, and honest delivery semantics.

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What happened

Techmeme surfaced this April 22, 2026 story in its Techmeme item, and the original article is OpenAI’s Making ChatGPT better for clinicians.

OpenAI is moving ChatGPT more directly into clinical work with a new product called ChatGPT for Clinicians. The product is designed for tasks like documentation, medical research, care consults, referral letters, prior authorization support, and patient instructions. It is initially free for verified individual clinicians in the United States, including physicians, nurse practitioners, physician assistants, and pharmacists.

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What this article is about

This summary covers The Economist’s April 11th, 2026 Business article listed in the contents as A dangerous new AI and published under the headline Mythical monster.

The article argues that warnings about AI danger are usually worth treating with skepticism, because frontier labs have incentives to dramatise their own progress. This time, though, The Economist thinks the warning may be genuine. Its focus is Anthropic’s latest model, Mythos, which the company says is powerful enough at discovering and exploiting software flaws that it should not yet be released broadly.

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A film story that is really about systems

Carl Weiseth’s article starts as a behind-the-scenes look at the speedriding film “L’Experience Magnifique,” but its real subject is the hidden infrastructure required to make spectacular mountain footage possible. The finished images may look effortless: tiny wings cutting down steep alpine faces, drone shots threading through gullies, skiers and pilots moving as if the mountain were an open playground. Weiseth makes clear that none of that ease is real. Every successful run depends on planning, communication, weather judgment, transport improvisation, and a group of people who understand that small mistakes in this environment can compound very fast.

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Supreme Court rules against Colorado ban on ‘conversion therapy’ for LGBTQ kids (r/news)

• effortfulcrumload: The satanic temple should open a conversion therapy camp for straight kids
• Slovic: This. Just like in the 60’s when Black Panther started to arm themselves all of a sudden guns were an issue.

Jan. 6 rioter pardoned by Trump gets prison sentence for possessing ’enormous child pornography collection’ (r/news)

• Honeycove91: Pretends to be shocked
• shhhhhasecret: I had to go borrow my mother’s pearls so I could clutch them.

American Heart Association urges people to favor plant-based proteins, replace full fat dairy (r/news)

• lfthinker: I feel like the prices are putting people off of eating beef more than anything any medical group could say.
• Low_Pickle_112: It’d be political suicide to even joke about doing something like this, but I wonder what would happen to those prices if we removed subsidies for animal products and let the free market that we all love so much decide.

House committee votes to subpoena Pam Bondi over Epstein files (r/news)

• Megaphonestory: She probably saw this coming since she is spying on everyone in the committee.
• Strange-Movie: Weird uptick in Google searches for “fuck you pam”

What’s one thing you completely stopped buying in 2026 because the price just felt absurd? (r/AskReddit)

• Zhong_Ping: Soda. $14 12 packs are outrageous.
• bitterverses: Streaming services. They’re charging more and showing less. It’s crazy

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Leave AI startup after 2 months? (Blind)

• AI_ML_FUN (New): Join us at Scale AI. We can’t hire fast enough!
• 4geff (Oracle): Definitely leave

How many of y’all quit to start ai startup? (Blind)

• .xxxxxxxx. (Tata Consultancy Services): I don’t think people with successful ai start-ups will be roaming around on blind.
• MagicBall (ex-AMD): It’s over for ai startups lol, build something people aren’t already crazy about.

Oracle fired up to 30,000 workers via email after a 95% profit surge. Tech companies are cutting almost 1,000 jobs/day (r/technology)

• loko3084: Tech companies treating humans like disposable apps delete, update profits, repeat.
• Neat_Trust3168: Who do they think is going to buy their shit if people don’t have money?

AI Leads All Reasons For U.S. Job Cuts In March, Report Says (r/technology)

• VincentNacon: No… Greed, greed is the real reason why they’re doing the layoff. They wanted to save money, so they valued that more than the person… and ironically, more than their products.
• Just-Install-Linux: I’m in IT and just don’t see AI really taking over at all. We use it, but not in a way that it replaces people. I think the economy just sucks and companies avoid tanking their stock by saying it’s due to the increased productivity of AI instead of the reality of hard times.

Announcement: Temporary LLM Content Ban (r/programming)

• standing_artisan: Yes finally no more LLM related content. Thank you ! Please don’t be April fools’ joke !!!
• johnnybgooderer: LLMs are a part of software engineering now. And eventually everyone is going to be using them for programming in some capacity.

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The article argues that the debate is framed the wrong way

Liam McGee’s “Online or In-Person?” starts with a question that sounds simple and familiar in modern outdoor education: if backcountry skiers can learn from videos, Zoom courses and polished online modules, how much does old-fashioned in-person instruction still matter? McGee answers by putting himself in the middle of both systems. Before joining an introductory ski-mountaineering course in Idaho’s Sawtooths, he studies online material from mountain guide Mark Smiley, practices knots at home and shows up with a decent store of concepts already in his head. On the bootpack, though, he quickly discovers that knowing the words is not the same thing as understanding how they live in terrain. Niels Meyer, the Sawtooth Mountain Guides co-owner leading the group, keeps answering McGee’s questions with some version of “it depends,” because every answer changes with angle, snow texture, partner position and immediate hazard.