Varoon Mathur

Health Care and MLOps.

Formerly White House, VA, FTC, and @AINowInstitute. TW/RT = Mine Only.

[NY Taxi Workers @NYTWA]

That's our member behind the wheel. He was pulled out of the cab and suffered shock and physical injury to his arm, back and head.

The whole city is elated about our hometown team — and that includes drivers who watched the game last night at airport lots while waiting for the next fare, listened on their radios while cruising for the next job, and huddled at hotel lines with the same heart-stopping anxiety that turned into the most beautiful joy.

Pulling the cab driver out of his seat, stomping on and shattering his hood turned our joy into a nightmare.

When you see the yellow, do you not see the person behind the wheel? That's someone's spouse, child, parent or friend — a New Yorker.

He wasn’t out there for a joy ride, he was working to make ends meet and to get his fellow New Yorkers home safely.

Cabbies pay just to go to work. They pay for their cars — whether through loans or leases.

Drivers need safety on the job, both in the quiet moments of ordinary days and in the middle of public celebration.

Shame on anyone who turns these joyful moments into nightmares for fellow New Yorkers.

[Daniel Wortel-London @dlondonwortel]

Pessimism of the intellect, optimism of the will

[Signal @signalapp]

Our statement on the UK government’s demand that all content on all devices sold or used in the country be scanned, on the presumption of nudity, using a dystopian combination of age verification and content scanning. This proposal will not safeguard children. It endangers us all.

https://t.co/VdWe9uhi8p

[Teg🚨 @IQfor3]

Crowd saying OG Anunoby at the same time as the announcer

[Adam Herman @AdamZHerman]

City vibes are hard to explain right now. There’s a guy smoking a cigar and holding a broom and everyone is shaking his hand as if he’s an essential worker during the pandemic.

[Oh No He Didn't @ohnohedidnt24]

KAT:

"I just felt a calm and a peace that had to be come from the woman above (his mom). I felt like a kid. It was just fun out here. It felt like I was a kid getting ready to go play my Saturday AAU games and Sunday AAU games. In a way I felt like I was seeing her in the stands"

[AzelfDa?🏳️‍🌈🏳️‍⚧️🐋 @AzelfDaGirl]

Mamdani legit building a machine in NYC holy, W ad

[Matthew Belloni @MattBelloni]

Lots of credit grabs around Hollywood for the breakout success of BACKROOMS, but at the very beginning, one lowly assistant clicked on a Reddit link and saw a potential movie. The full backstory ⬇️⬇️ https://t.co/pBiuFVGcfX

[Rod Wong, MD @docrodwong]

a standing ovation for daraxonrasib at asco. over 40k oncologists, entrepreneurs, investors, and patient advocates together celebrating revmed's breakthru in the fight against pancreatic cancer. u never forget these moments. it's what innovation is all about.

[Bercan @bercankilic]

We built a magic hat to capture the entire archive of human data.

[Varoon Mathur @VaroonMathur]

@pritopian *in-house counsel lmao

[Madison Mills @MadisonMills22]

Corporate America enters its AI reckoning phase as IT bills keep rising and consumer sentiment nosedives.

My latest, which includes an account from a CFO fretting over a half a *billion* dollar accidental AI bill: https://t.co/EQhgn0v8DI

[Ed Zitron @edzitron]

Completely insane!

[BuccoCapital Bloke @buccocapital]

Levie’s Law of AI Psychosis:

The farther away you are from the actual work the more confident you are that humans are no longer needed

I like it

[Praneet Mylavarapu, MD @PMylavarapuMD]

Something just changed in medicine that most physicians haven't noticed yet.

As of early 2026, a practicing doctor can prototype a working clinical tool — solo, in a weekend. No CS degree. No team. No budget.

I gave Cardiology Grand Rounds @UCSDHealth on the emerging role of the physician-developer today.

Here's what changed, and why the next decade of medical software gets built by us 🧵

[brian @brianonhere]

fragment of journal entry found in abandoned bunker level of video game

[Sanat Mishra @sanatmishra7]

Everyone is racing to build medical AI agents.

Almost nobody is stress-testing the judges grading them.

We tested frontier models as judges on @OpenAI HealthBench answers.

Then we hit the answers with adversarial perturbations:

Delete a negation.
Tamper with clinical values.
Reverse the conclusion.
That’s it.
Most LLM judges missed the mistakes.

@claudeai Opus 4.7 missed an obvious medical lie 83% of the time.

@Gemini 3.1 Pro Preview was the best model we tested and still missed 43%.

Why this matters:

These judges are becoming reward models, safety filters, eval graders, and training signals for healthcare agents.

If the judge can’t catch the lie, the model trained on that judge learns the blind spot.

The failure does not stay in the eval.

It propagates.

First post in our @getbiostack x VibeOps Research series on where LLM-as-judge breaks in medical AI.

Full piece:
https://t.co/koc7HvRqzz

Thumbnail artwork inspired by H. Matisse.

[Julie Slama @SenatorSlama]

Generally, I love Starlink. It’s fast, reliable, and my husband and I run our law firm from home with it. HOWEVER- it’s monopolized internet in rural areas.

Today, we received notice our internet bill is going up another $500/year. Don’t like it? Too bad. You have no other options. Nebraska gave up $300 million in federal rural internet funding for fiber because “Starlink fixed it.”

This was a mistake that will cost Nebraskans dearly in the long run.

[Congressman Pat Harrigan @RepPatHarrigan]

For 20 years, a $6 knob that takes one hour to 3D print has been grounding Black Hawk helicopters four times a month, and the contractor responsible won't sell us the part or the IP rights to fix it ourselves.

So instead, American taxpayers have been paying $40,000 every single time to replace the entire system, multiplied by four times a month, for two decades.

That is NOT a procurement problem, that is a shakedown, and it is exactly why right to repair has to be in this year's NDAA.

[Nick Frosst @nickfrosst]

lets do more of this and less gambling apps. this is what startups should be all about.