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Michael L. Barnett

@mlbarnett.bsky.social

1k Following2.3k Followers

health policy researcher, primary care physician, dad

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@mlbarnett.bsky.socialOct 9, 2026, 9:29 PM

what else can we do?? sigh. but i do want to normalize these experiences as typical, not outliers.

@mlbarnett.bsky.socialOct 9, 2026, 9:01 PM

Another grant not discussed ๐Ÿ™‡โ€โ™‚๏ธ๐Ÿ˜“๐Ÿคทโ€โ™‚๏ธ๐Ÿ‘Ž Just have to roll with the punches and try again. I sure wish the NIH cycle was faster though.

@brownpublichealth.bsky.socialOct 9, 2026, 5:15 PMReposted by @mlbarnett.bsky.social

Professor @mlbarnett.bsky.social has found that amid the explosion in training programs for our expanding #nursepractitioner workforce, nearly 1 in 3 new NPs is being educated by a for-profit program.

Dr. Barnett's reasons for concern: https://www.brown.edu/news/2026-10-08/profit-nurse-training

@jenszalai.bsky.socialOct 8, 2026, 11:40 AMReposted by @mlbarnett.bsky.social

It was a short call, Carlberg said: All the poet would say was she
was "in Iceland," where she was
"listening to the wind."
NThe New York Times@nytimes.comOct 8, 2026, 11:09 AM

Breaking News: The Nobel Prize in Literature was awarded to the Canadian poet and essayist Anne Carson. nyti.ms/4yCUebH

nyti.msAnne Carson Is Awarded Nobel Prize in LiteratureThe writer joins a list of laureates that includes Toni Morrison, Samuel Beckett and Bob Dylan.
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@bakerdphd.bsky.socialOct 7, 2026, 3:00 PMReposted by @mlbarnett.bsky.social

Finally a proper working paper for this study that produced one of the most astounding figures I've ever seen. Basically economics is different from every other field, empirically. This paper looks at the concentration of university affiliations for award winners.

www.nber.org/papers/w35875

Figure 2 from the paper: institutional concentration of university affiliation at time of award correlated with institutional concentration of phd granting university. Economics is the most concentrated of any field. 
Figure 2 from the paper: institutional concentration of university affiliation at time of award correlated with institutional concentration of lifetime employment. Economics is the most concentrated of any field.
@crumb.bsky.socialOct 7, 2026, 2:44 PMReposted by @mlbarnett.bsky.social

news.ycombinator.com/item?id=4998...

ihoggan 
 I was a graph theory junkie long ago and even moved to Budapest for awhile to study among the greats. While I was there I started working on Barnette's Conjecture which came to occupy my thoughts over the next 24 years of my life, on and off as I worked in many different fields. Last summer I even thought for a few days that I had actually solved it. But it's supposedly proven here - problem 180. I don't know what to think exactly. I spent thousands of hours on that problem. I really enjoyed it. Hearing that it is solved somehow makes me sad in a far-off way, like hearing an ex-girlfriend died suddenly in a car crash. I don't know, there's probably a lot of people feeling odd emotions tonight. There's no Lean proof for this one so I'm digesting the paper. On the surface it looks like an approach I considered 24 years ago and abandoned. 
I revisited the problem this summer, along with my partial solutions, when the previous round of stunning proofs came out. Several hours of work with Fable simply convinced me it wasn't yet solvable and reinforced how hard of a problem it was. 
 WheelsAtLarge
I have very little understanding of higher math, so I ask you: Was the proof due to a type of brute-force solution that could be solved had you gained enough information from reading others' work, or was it more like a proof that was sparked by an insight that came once a clue on how to solve it was put forward? I guess my question is: Was the problem proven by using a collection of everyone's work, or was it due to a brand-new insight? 
reply 
jboggan
 Hi I'm still digesting the proof and translating a bit from the dual case back to the primal in which I most commonly thought about it. I don't think it was a brute force proof in the sense that it combined every possible paper and commentary. It's rather odd because I feel like most of the work on the conjecture was focused on an induction proof based around graph reductions, and this proof avoided those issues entirely by offering a concrete constructive proof of finding a Hamiltonian cycle. Rather, it explicitly selected the edges not in the Hamiltonian cycle, which is in line with previous attempts via the dual. 
The "oho" insight for this is actually f**ing wild, it involves a complex valued exponential sum on the edges. I've seen a lot of clever counting arguments before in graph theory but this is the first time I've seen complex roots and annihilating terms like this, the symbolic manipulation tricks in this look like things out of quantum physics. I don't understand where this trick originated, I need to really digest this. 



jboggan
 I went back to that Fable chat and showed it this new preprint. It coded up the new constructive algorithm and ran it against the existing test suite, that looks good at least. 
It has been super helpful in delineating where the crucial concept came from. The proof is rather simple as graph theory proofs go, but it does seem to use some constructions that would only seem obvious if you had serious physics experience with partition function and calculating energy states that cancel out. It's not a wholly alien bolt from the heavens, but I can also see how there hasn't been a human being with the broad theoretical physics knowledge combined with the deep graph theory experience in planar graphs to come up with this idea. I don't know, I'm looking for precedents of this formulation and some old papers of Penrose counting the number of edge colorings of this same graph type are coming up, the line of argument at least rhymes. But I agree with the thought that this sort of progress should not be siloed inside those companies. I propose a tax so that every slop cannon Al video pays for another hour of compute time for advancing mathematics. 
reply
ZZach Weinersmith@zachweinersmith.bsky.socialOct 6, 2026, 10:46 PM

OpenAI just blooped hundreds of proofs and counterexamples to open problems: github.com/openai/math/... Boggling.

github.commath/preprints at main ยท openai/mathContribute to openai/math development by creating an account on GitHub.
8
@mlbarnett.bsky.socialOct 7, 2026, 1:37 AMReposted by @mlbarnett.bsky.social

new research with @hneprash.bsky.social and others in @annalsofim.bsky.social

Advanced practice registered nurses (APRNs) are an exploding workforce. For-profit companies are starting to get in on the training boom. What's been happening nationally? Buckle up!

www.acpjournals.org/doi/10.7326/...

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AMReposted by @mlbarnett.bsky.social

We decided to look deeper into what is happening. My team pulled nursing rosters from CA, FL, IA, and TX and classified the schools training NPs as for-profit or non-profit. We found something shocking - nearly 1 in 3 newly licensed NPs in 2024 was trained at a for-profit school! That's massive.

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AM

Thanks to my wonderful team including two amazing nursing researchers Hilary Barnes and Elizabeth White, also Brianna Hardy and Ellen Latsko. Send questions or thoughts my way.

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AM

Our piece just describes this growth, so we can't say anything about quality. But there are concerns and little transparency in how for profit education + clinical outcomes compare to other schools. The story didn't turn out well for RN education.

www.journalofnursingregulation.com/article/S215...

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AM

The growth varies a lot by state too - in California, the number by 2024 is over 40% of NPs trained in for profit programs. This boom is driven strongly by a small number of for-profit schools like Walden and Chamberlain, owned by the same corporate parent formerly known as DeVry.

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AM

We decided to look deeper into what is happening. My team pulled nursing rosters from CA, FL, IA, and TX and classified the schools training NPs as for-profit or non-profit. We found something shocking - nearly 1 in 3 newly licensed NPs in 2024 was trained at a for-profit school! That's massive.

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AM

The APRN workforce is growing very rapidly and they all need graduate degrees. For-profit companies have noticed. The concern is that for-profit schools cut a lot of corners - distance education, students find their own clinical training, and more.

www.milbank.org/publications...

@mlbarnett.bsky.socialOct 7, 2026, 1:37 AM

new research with @hneprash.bsky.social and others in @annalsofim.bsky.social

Advanced practice registered nurses (APRNs) are an exploding workforce. For-profit companies are starting to get in on the training boom. What's been happening nationally? Buckle up!

www.acpjournals.org/doi/10.7326/...

@chalkbeat.orgOct 6, 2026, 8:30 PMReposted by @mlbarnett.bsky.social

For decades, some Boston students have traveled to suburban schools through Metco. New research finds strikingly large benefits years later.

@mlbarnett.bsky.socialOct 6, 2026, 2:48 AM

PS they let the butterfly out in the playground at the end of the science section

@mlbarnett.bsky.socialOct 6, 2026, 2:47 AM

this is ABSOLUTE INSANITY. next up, investigating 3rd grade teachers for imprisonment of caterpillars in science education.

www.nytimes.com/2026/10/05/h...

@mlbarnett.bsky.socialOct 4, 2026, 3:13 AM

New MAHA priorities: - bring back full dose aspirin - HRT for CV prevention - tonsillectomy for all - stent all coronary arteries - required annual PSA test - make benzos and opioids great again

@mlbarnett.bsky.socialOct 3, 2026, 4:29 PM

reductions in crime happened before greening! interesting Hawthorne like effect with interest implications for neighborhood effects. can't wait to see more @atheendar.bsky.social

@mlbarnett.bsky.socialOct 3, 2026, 4:26 PM

!!!!!

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