Arvind

Here's a lecture I gave on RLHF and the new DPO paper which proposes a wonderful alternative to OpenAI's PPO algorithm. If you are interested in improving the quality of your LLM completions using RLHF, please watch this video. youtu.be/Ju-pFJNfOfY

Thankfully the LiteLLM package has now been marked as "quarantined" on PyPI so attempting to install the compromised update via pip et al shouldn't work

@jeremyphoward Thanks Jeremy ☺️ Let me go through this and try to digest the ideas.

@nagaraj_arvind I'm focused on "how to make AI helpful to humans". We created solve.it.com to help towards that. It's been fantastic - very happy spending time on that! :)

If you're gonna be an asshole and use bots to reply, at least don't be a *stupid* asshole and have your both reply to the wrong thread. 🙄

@BrianRoemmele Cardboard houses

Roofing.

2 years ago, I met @Shauryapranos and @roshgor over idlis at Airlines. They were planning to build a fusion energy company in India. There was no ecosystem for it, no playbook, no capital. Most people I mentioned it to thought I'd lost the plot. No investment committee would have approved a pre-seed cheque into an Indian nuclear fusion startup in 2024. It would've been laughed out of the room. What I saw, however, was two people who understood fusion physics and engineering at a level that made me feel like a student again. Two athletes who had decided that this was the Marathon of their life. @industrial47 wrote the first cheque. Today, they are a team of 8 PhDs with an integrated fusion development stack, a Tokomak reactor about to hit first plasma and have just raised a $6.8Mn round. Congratulations Roshan, Shaurya and team @PranosFusion! The hard part is ahead, but I wouldn't bet against you two. Welcome to the grand run - @piventures, @ankurcapital, @lkeshre, @MarsShotVC, @shashank_kr, @harshilmathur, @shashankmehta05 and @npbhukhanwala.

@anishmoonka Ah salt n sand batteries back in vogue

Your fridge runs 24 hours a day. Solar panels only work while the sun’s out. That mismatch is the entire reason this plant exists, and the fix is just hot salt. The Dunhuang plant in China’s Gobi Desert uses 12,000 mirrors aimed at a single tower about as tall as an 80-story building. All that focused sunlight heats a mix of salts (the same stuff in fertilizer) to 565°C, hot enough to glow red. That liquid salt gets pumped into giant insulated tanks. The tanks are so well insulated they only lose about 1°C per day. When the city needs electricity at 2am, the hot salt boils water into steam, the steam spins a turbine, and you get power. Same basic process as a coal plant. Just no coal. Here’s what makes this different from regular solar: the storage lasts 11 hours. Sun goes down, plant keeps running all night. The big batteries that cities plug into their power grids right now? Those typically hold about 4 hours of electricity. Building batteries that last 11 hours is possible, but the cost balloons fast. A German energy storage study found that storing energy in hot salt costs roughly 33x less than storing it in the lithium-ion batteries we use today. China has built 27 of these plants so far, enough to power roughly a million homes. They doubled that number in 2025 alone. Another 3,000 megawatts (enough for about 2 million more homes) are under construction right now, with 4,000 more in the planning stage. Beijing wants 15,000 megawatts by 2030. The US tried this same technology once. Ivanpah, out in the Mojave Desert. Cost $2.2 billion. But they skipped the storage part entirely, so it could only make power while the sun was shining. It needed natural gas every morning just to start up. It’s now slated to shut down in 2026, thirteen years early, because regular solar panels got so cheap they made the whole project obsolete. China took the same idea, added the one part America left out, and is now building dozens of them. One more thing worth knowing. The salt is made from basic industrial chemicals. No lithium mining. No cobalt. No rare earth metals. And it lasts 30 years of daily use before the tanks need work.

@Fintech03 Bismuth is more beautiful than gold

1 might ask: Why does not it just flip over & stick to the crystal? Most magnetic materials (like iron) are Paramagnetic, they are attracted to a magnet. Bismuth is the most Diamagnetic naturally occurring element. When a magnet gets close to Bismuth, the bismuth does not just push back. It induces a weak magnetic field inside itself that is exactly opposite to the magnet’s field. The secret to the levitation is not the Bismuth alone; it is a Top-Down Balance. We usually need a lifter magnet above the setup to cancel out 99% of the weight, leaving that tiny 1% for the Bismuth to handle. W/o that top-down help, the Bismuth is too weak to lift a standard magnet. It is a 3 way tug-of-war b/w gravity, the lifter, & the crystal.

Doctor fixed A severe Scoliosis with Halo gravity traction method in children's (straighten the spine).

@thegogoliath @Rainmaker1973 @grok @grok answer him

@Rainmaker1973 @grok is this ai?

Balance [📹 Wang Yekun]

@JoshuaBarzon South of 3 is where it's at

where would you choose to spawn?

Operant conditioning training [📹 kira__family]

@ThePrimeagen @JosephJacks_ 😆

Kyber Labs Robot Hand.

The internet runs on a coincidence of atomic physics. Erbium emits light at exactly 1,550 nanometers. Silica glass fiber loses the least signal at exactly 1,550 nanometers. One is a quantum property of a rare earth element, the other is an optical property of melted sand. They have nothing to do with each other. It is pure luck. Before erbium-doped fiber amplifiers, every undersea signal had to be converted from light to electricity and back every 50 kilometers. Each conversion degraded the signal and capped bandwidth. Erbium removed that cap. An erbium amplifier sitting on the floor of the ocean boosts signals 1,000 times and runs for decades without maintenance. 99% of intercontinental data moves through glass strands no thicker than a human hair, amplified by a rare earth element that just so happens to emit at the right wavelength. And erbium isn't even the strangest one.

@yacineMTB @chris_j_paxton HARDware for a reason

ahahahahahahahaahhaahahahahahaha okay you guys were right this hardware shit is hard.

@BrianRoemmele Beautiful 😍

The Nokia nano hard drive. A collectors item.

@sweetener_lily @forallcurious spoken like a true mushroom!

@nagaraj_arvind @forallcurious This is what I was wondering. We did just discover that mushroom that actually eats plastic so I’m hoping something related to that

🚨: This machine is capable of cleaning up 100 million kg of plastic ocean waste, and as of 2025, it has already collected about 500,000 kg of plastic. It aims to remove 90% of ocean plastic by 2040.

made my computer dramatically play BBC news music before every meeting