Sam Harsimony
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harsimony.bsky.social
Sam Harsimony
@harsimony.bsky.social
I write about opportunities in science, space, and policy here: https://splittinginfinity.substack.com/
Pinned
Thread of my new posts in the replies (and some summaries of old ones).
Reposted by Sam Harsimony
RE2 (Prompt Repetition) method. Explaining why the "Causal Mask" makes AI LLM models functionally blind, and how a simple copy-paste creates a bidirectional "U-turn" that boosts accuracy from 21% to 97% on key benchmarks www.youtube.com/watch?v=XZ1Q...
RE2: The "Stupidest" AI Breakthrough That Actually Works
YouTube video by Reinike AI
www.youtube.com
January 16, 2026 at 12:56 PM
Haven't read but looks interesting. Make everything sparse.
www.perceptron.inc/blog/composi...
Perceptron
A layer of intelligence for the physical world. We are a research company building the future of Physical AGI.
www.perceptron.inc
January 25, 2026 at 7:38 PM
LLM providers will have to become arbiters of truth:
bsky.app/profile/hars...
Not a new thing, to be sure, and I actually wouldn't blame the companies for this. LLMs cannot discern source quality, so hard coding against the use of bad sources will always be a post-hoc effort.
January 25, 2026 at 7:33 PM
Preliminary model/tests for digital consciousness finds that 2024 LLM's have 10% chance of consciousness, while a human gets to ~90% on these measures.

We should start taking AI welfare/personhood seriously.
www.greaterwrong.com/posts/YftBFE...
Digital Consciousness Model Results and Key Takeaways
Artificially intelligent systems, especially large language models (LLMs) used by almost 50% of the adult US population, have become remarkably sophisticated. They hold conversations, write essays, and seem to understand context in ways that surprise even their creators. This raises a crucial question: Are we creating systems that are conscious? The Digital Consciousness Model (DCM) is a first attempt to assess the evidence for consciousness in AI systems in a systematic, probabilistic way. It provides a shared framework for comparing different AIs and biological organisms, and for tracking how the evidence changes over time as AI develops. Instead of adopting a single theory of consciousness, it incorporates a range of leading theories and perspectives—acknowledging that experts disagree fundamentally about what consciousness is and what conditions are necessary for it.
www.greaterwrong.com
January 25, 2026 at 6:40 PM
Reposted by Sam Harsimony
ALL MN PROTESTERS

Absolutely nothing could be worse for our cause than violence and rioting. It is what ICE and Trump obviously want. Do not burn down our own city to protest invaders; they do not care; they will enjoy it. Do not do it. Do not let your fellow protesters do it.
January 24, 2026 at 5:47 PM
More people should be doing this. If you're getting annoying replies or a post blows up, just change the interaction settings!

Dummies will continue to exist, but whether or not you see or interact with them is within your control.
Been getting more attention on its posts lately so it is limiting interactions to follows and followers to keep the conversations between the nice people it has met and not weird random hostile people
January 24, 2026 at 5:10 PM
Russia's tank stockpiles have shrunk by 3x since the invasion started. Those that remain are old and possibly unusable.

Russia produces ~400 tanks/year and loses ~1000/year in the war.

www.youtube.com/watch?v=wCeA...
The Last Remaining 'Large' Stock of Tanks - T-62: The Last Hope
YouTube video by Covert Cabal
www.youtube.com
January 23, 2026 at 6:20 PM
Range seems kinda small, but I am excited about hybrid electric as the future of regional air travel and just generally making short flights cheaper.
EVIO wants to build a fleet of hybrid electric aircraft, including a 39 ton passenged plane with 76 seats abd 900 km range, a drone transporter and a... flying laser gunship with a megawatt-scale beam?
evio.aero
January 23, 2026 at 5:44 PM
In an era where 3D printing makes whistles for protesters and drones for Ukraine, regulating it is pro-tyranny.
JFC this bill is dystopian. It basically mandates putting DRM and spyware on all 3-D printers, all in the name of gun control (and if you think it will stop with firearms, I have a bridge to sell you). This would wipe out the maker movement at a time when it's finally starting to become accessible.
No Longer Fiction. The 3D Printing Ban Is Here
YouTube video by Loyal Moses
youtube.com
January 23, 2026 at 5:40 PM
Found perusing Greg Yang's blog. Certain parameterization (mu-P) can transfer hyperparams across several OOM's.

Found best hyperparams for 40M model and transfer to a 6.7B model.

The 6.7B outperforms the small 13B version of GPT-3 from orig. paper.
decentdescent.org/tp5.html
Tuning GPT-3 on a Single GPU
Cross-posted from Microsoft Research Blog
decentdescent.org
January 23, 2026 at 5:07 PM
Anthropic seems to be focusing on applying Claude to important fields rather than competing on chat or building AGI. This looks like the RLaaS strategy to me.

xcancel.com/aakashgupta/...
xcancel.com
January 23, 2026 at 3:29 AM
Just came across Celeste's blog. Many irreverent posts that I found myself nodding along to. Thread of some I liked.

ceselder.substack.com/p/vapings-vi...
vaping's vibes problem is killing people
You might believe in misinformation!
ceselder.substack.com
January 22, 2026 at 10:29 PM
Probably the most comprehensive data on commodity prices I've seen. Renewable goods like food fall in price over time, exhaustible resources seem to stay roughly flat, with brief spikes and occasional innovations.

See my comment on econ theory.

www.construction-physics.com/p/do-commodi...
Do Commodities Get Cheaper Over Time?
This American Enterprise Institute chart, which breaks down how price changes for different types of goods and services in the consumer price index, has by now become very widely known.
www.construction-physics.com
January 22, 2026 at 9:56 PM
Found an old paper about Terraforming Venus. Very similar to a post I haven't finished yet. Though I think it gets a few details wrong.

www.orionsarm.com/fm_store/Ter...
www.orionsarm.com
January 22, 2026 at 9:02 PM
Reposted by Sam Harsimony
holding down the fort on bluesky through the lean years is paying off

any other week even just you coming over would be an enormous W

this week, dozens have come!

thank you nikita 🙏
January 22, 2026 at 8:15 PM
People who use twitter but would prefer everyone on bsky should consider publicly announcing 1 week break from twitter.

Value of twitter comes from attention of small accounts like yours. Everyone would move if small accounts could coordinate. Publicly announcing your exit helps coordinate.
January 22, 2026 at 7:04 PM
cheap 3D printing of one of the optical components of a multifocal structured illumination microscope.

Important because if we're gonna upload our connectomes, we need far more and cheaper microscopes.

opg.optica.org/boe/fulltext...
January 22, 2026 at 6:51 PM
Nice to see an update on what Taelin is working on! Super cool.
DEMO TIME

SupGen is a generative coding AI... except it isn't an AI.

There is no model, there is no pre-training. You just give it some examples, and it gives you a program. It runs locally, in a single-core CPU. Oh, and it can also prove theorems.

www.youtube.com/watch?v=Gddk...
SupGen: an AI-free code synthesis tool (demo)
YouTube video by VictorTaelin
www.youtube.com
January 22, 2026 at 2:59 PM
Reposted by Sam Harsimony
If you are on X, can you please repost/like/reply to this for visibility? I want people on here.

x.com/cameron_pfif...
x.com
January 21, 2026 at 9:29 PM
Reposted by Sam Harsimony
Interjecting on politics, this is horrific and I want to make sure folks are broadly aware of this
🚨HOLY CRAP. An ICE whistleblower just revealed a secret memo authorizing ICE officers to break into homes without a judicial warrant, which DHS's own legal training materials say is unconstitutional!

ICE then hid the memo from the public, passing it along by word of mouth and private conversation.
January 21, 2026 at 10:35 PM
Wow this is sick.

Imagine a future where farmers in developing countries use climate change simulations to optimize the crops they plant and buy insurance.
Introducing HiRO-ACE: an AI framework that makes highly detailed climate simulations dramatically more accessible. It generates decades of high-resolution precipitation data for any region in a day on a single GPU—no supercomputing cluster required. 🧵
January 21, 2026 at 8:38 PM
What's twitter like for those who participate there and here?

How are people thinking about the tradeoff between "stay and evangelize bsky" vs. leave?
January 21, 2026 at 7:34 PM
"... a one-line, optimizer-agnostic modification that applies weight decay only to parameter coordinates whose signs align with the optimizer update" (H/T Alexander Kruel)
arxiv.org/abs/2510.12402

Reminds me of R-prop
en.wikipedia.org/wiki/Rprop
Cautious Weight Decay
We introduce Cautious Weight Decay (CWD), a one-line, optimizer-agnostic modification that applies weight decay only to parameter coordinates whose signs align with the optimizer update. Unlike standa...
arxiv.org
January 21, 2026 at 7:31 PM