Achaye

[Andrej Karpathy @karpathy]

Personal update: I've joined Anthropic. I think the next few years at the frontier of LLMs will be especially formative. I am very excited to join the team here and get back to R&D. I remain deeply passionate about education and plan to resume my work on it in time.

[Wes Bos @wesbos]

never give up

[The Culturist @the_culturist_]

Libraries are supposed to be magnificent temples of learning.

These are the 25 most beautiful examples on Earth 🧵

1. Trinity College Library, Dublin, Ireland 🇮🇪

[Ryan Florence @ryanflorence]

I had this argument with a “backend dev” on our team. I made an endpoint specifically for the UI I was building and only needed 2 (complicated but efficient) DB queries to get it.

He insisted I use the existing REST endpoints and blocked my PR.

So I did it his way and made 13 requests with several sequential chains. The DB load, network load, and UX were all far worse. I profiled it and showed the numbers and included our ops/infra team on the next PR.

They blocked the new PR and merged the original with a bespoke endpoint 😂

[Sebastián Ramírez @tiangolo]

I saw a job post the other day. 👔

It required 4+ years of experience in FastAPI. 🤦

I couldn't apply as I only have 1.5+ years of experience since I created that thing. 😅

Maybe it's time to re-evaluate that "years of experience = skill level". ♻

[Andrew Côté @Andercot]

First video of LK-99 Full Levitation, aka flux-pinning

This video was just posted to the Chinese video-sharing site BiliBili and claims to be a highly pure synthesized sample of LK-99.

What is the physical phenomenon behind this and what does it mean?

Levitation of superconducting materials is a phenomenon unique to what is called Type-II superconductors, and is an effect whereby magnetic field lines becomes 'trapped' as it passes through the material, providing the force needed to levitate. These are the popular images and videos of cryogenically-cooled discs floating above a magnet frequently seen online and in the pinned post on my profile.

You can think of this like strands of hair being caught in gum - the gum is suspended in mid-air by adhering strongly to the hair as the hair passes through it. The hair in this case is magnetic field lines and the gum is the Type-II superconductor. Just like hair comes in individual strands, or in other words hair is 'quantized' or 'discrete', so is the flux trapped at the 'pinning centers' quantized in what are called 'magnetic vortices' - the quantization of pinned flux lines is a key property and distinguishing characteristic of Type-II superconductors (although technically can occur in Type-I superconductors if the material thickness is smaller than the London penetration depth, which is indeed very small - specifics for the physics nerds out there).

Flux-pinning is entirely unique to superconductors and is also wholly distinct from the Meissner effect. It is not a property of diamagnets or diamagnetism.

At @TRIUMFLab I contributed to flux-pinning studies in Niobium crystal superconducting radio-frequency cavities used for particle acceleration. In that application, trapped flux poses an issue by increasing the remnant surface resistivity of the cavity, which has the effect of decreasing its effective quality factor or Q-factor, which is a measurement of a resonators efficiency. SRF cavities typically have Q-factors of 10E10 and trapped flux at pinning centers reduces the maximum effective accelerating electric field used to drive charged particle bunches close to the speed of light.

Flux pinning is thought to arise in some Type-II superconductors by small imperfections in the crystal, also called volume defects, that enable flux to penetrate the material. In SRF cavities an issue that arises is any magnetic field that is passing through the material, e.g. by the Earth's background field, can become pinned or trapped inside the cavity as it transitions into a superconducting state. See some attached plots in the comments from a study showing how the surface resistivity of SRF cavities increases the more there is a background field as the cavity transitions into superconducting state.

This is the first video I am aware of that claims to show the flux-pinned levitation of a LK-99 sample. If this is in fact what is happening, then it is a very unique and promising finding of this new materials properties and potential for future study.

If this is real then it is truly ground-breaking

[World of Statistics @stats_feed]

🍍 The word "pineapple" in different languages:

🇦🇿 ananas
🇧🇾 ананас
🇧🇬 ананас
🇭🇷 ananas
🇨🇿 ananas
🇩🇰 ananas
🇳🇱 ananas
🇪🇪 ananass
🇫🇮 ananas
🇫🇷 ananas
🇩🇪 Ananas
🇬🇷 ανανάς
🇭🇹 anana
🇭🇺 ananász
🇮🇸 ananas
🇮🇩 nanas
🇮🇪 anann
🇮🇹 ananas
🇱🇻 anannas
🇱🇹 ananasas
🇳🇴 ananas
🇵🇱 ananas
🇷🇴 ananas
🇷🇺 ананас
🇷🇸 ананас
🇸🇰 ananás
🇸🇮 ananas
🇸🇪 ananas
🇹🇷 ananas
🇬🇧 pineapple 😳
🇺🇦 ананас

[Quincy Larson @ossia]

freeCodeCamp just published a FREE full-length book on Regular Expressions by @Ksound22.

You'll learn RegEx concepts like:
⛳️ Flags
🎭 Metacharacters
🤹‍♀️ Grouping
👀 Lookaround, and other advanced techniques.

Read it, bookmark it, tell your friends.

https://t.co/tFUSQrtQTw

[Sabine Hossenfelder @skdh]

My mum didn't want to buy me a Barbie doll when I was a child. Eventually I bought one from my pocket money. I really liked the many movable parts. ➡️ Don't be afraid to let your daughter play with a Barbie doll, she might still end up being a physicist.

[Alex Hormozi @AlexHormozi]

We’re officially past the halfway point of the year.

If you’re not more than halfway to your goals…time to lock in.

Champions are made in the second half.

[Amjad Masad @amasad]

Not only have they mapped out the fruit fly brain, but they actually boot it up in a computer and made it “eat” and “groom” 🤯

[Danny Thompson @DThompsonDev]

For over 10 years of my life, I worked at multiple gas stations frying chicken.

- I learned a new skill
- Built an entire career out of this
- Changed the trajectory of my career and life.

To NOW speaking in rooms where people sat on the floor because we ran out of chairs. 🤯

[Taylor Welch @taylorawelch]

If they only call when they need something they’re not your friend.

[Alex Hormozi @AlexHormozi]

A lot more people would be advanced if they actually did the “beginner shit” they think they’re too good for.

[Justin Timberlake @jtimberlake]

#RalphYarl accidentally rang the door of the wrong house while trying to pick up his siblings. For this, a man shot him in the head. Then shot him a 2nd time as he was on the ground. The man is free and the 16-year-old is fighting for his life in the hospital. This can’t be it.

[Tim Cheadle @timcheadle]

@sarah_edo Totally. Confidence is also being totally comfortable being wrong. Arrogant folks have a hard time even approaching vulnerability.

Can we also talk about mistaking being nice for being effective?

[sophie alpert @sophiebits]

TIL that the react source code used to have a method called dispatchEventWithEnableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay. hope you don't like 80-character lines

[Elon Musk @elonmusk]

Starship is ready for launch 🚀

Awaiting regulatory approval

[Buchr @theBuchr]

@ania_kubow After successfully commit a bug fix