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Dr. Ryan T Johnson

@ryantjohnson.bsky.social
445 followers 1.2K following 68 posts

Mathematician, data-explorer, bicycle-rider, husband, father of four, one of whom has trisomy-21.

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Reposted by Dr. Ryan T Johnson
Dave Levitan @davelevitan.bsky.social · 02/10/2026
You're gonna need a bigger chart
Chart showing the daily sea surface temperature for the Nino region of the Pacific, with a red line for 2026 shooting off above every other year in record-setting territory, with the latest spot right at the top of the chart
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Joel Bezaire @joelbezaire.bsky.social · 02/10/2026
#iteachmath
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Randall Munroe @xkcd.com · 01/10/2026
If I went to Switzerland and won a Swiss watch precision contest, I would literally never talk about anything else
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American Mathematical Society @amermathsoc.bsky.social · 30/09/2026
You now have more time to apply to fund your research. Application closes October 5 for the Joan and Joseph Birman Fellowship for the Advancement of Women Scholars, the Claytor-Gilmer Fellowship, the AMS Centennial Fellowship, and the Stefan Bergman Fellowship. Link in comments.
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Sahil Kapur @sahilkapur.bsky.social · 29/09/2026
A phenomenal moment in the Senate. Eric Schmitt, R-Mo., claims he has evidence Jack Smith went to a HAWKS game in Atlanta. Smith denies it. Schmitt declares he has busted Jack Smith for perjury. Smith, vexed, says he went to HAWKEYES game in Maryland. WATCH IN FULL, UNINTERRUPTED
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ViCBiostat @vicbiostat.bsky.social · 23/09/2026
Seminar announcement Dianne (Di) Cook: Practical Tools for Data Exploration in Biostatistics 15 October, 4-5pm AEST via Zoom Further details: www.vicbiostat.org.au/event/practi... @visnut.bsky.social
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ProPublica @propublica.org · 22/09/2026
Sen. Susan Collins helped steer millions in federal defense contracts to Navatek, whose CEO illegally funneled thousands of dollars to her campaign. The FBI sought to launch a probe and was eyeing Collins and other lawmakers. Then Trump gutted the unit in charge. THREAD 🧵
Martin Kao, CEO of defense contractor Navatek, poses next to Sen. Susan Collins for a photo. Collins is holding a model of a boat in her hands. Behind them is a large sign with the Navatek logo.
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lukelukeluke @lukelukeluke.bsky.social · 16/09/2026
Me: I’d like a slice of pizza Server: that comes with three sides Me: I know what shape it is
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Jerry Chen @jcsalterego.bsky.social · 08/09/2026
(standing in front of the "not getting a lot done" factory) i hope i get a lot done today
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Barack Obama @barackobama.bsky.social · 15/09/2026
The right to vote is one of the most fundamental parts of our democracy. Check your voter registration at IWillVote.com and make a plan to vote early or on Election Day on November 3.
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Kristin Du Mez @kkdumez.bsky.social · 15/09/2026
LIVE LAUGH LOVE releases today! Amy Grant, Sandi Patty, Catherine Marshall, Janette Oke, Little House, Elisabeth Elliot, Mary Kay, Allie Beth, LuLaRoe, Precious Moments, and Ballerina Farm. They’re all there.
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Jonathan Slater @jonathanslater.bsky.social · 07/09/2026
I give you : the Potoo
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BWJones @bwjones.bsky.social · 03/09/2026
The 2026 Audubon Photography Award Winners: www.audubon.org/magazine/202...
audubon.org
The 2026 Audubon Photography Awards: Winners
We invite you to enjoy the winners of Audubon’s annual photo awards—featuring stunning moments with birds across the hemisphere.
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Courtney Ellis @courtneyellis.bsky.social · 03/12/2024
We must not break things we cannot fix. --Wendell Berry
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Leah Reich @leahreich.com · 31/08/2026
I’m sure most of you aren’t watching the US Open right now which means you missed this instantly iconic moment, now available in gif form
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Geoff Brumfiel @gbrumfiel.bsky.social · 27/08/2026
New from @vantortech.bsky.social. Absolutely astonishing images of the China-Nepal Gyirong Port/Rasuwagadhi border post. Literally nothing is left. (Before 19 April, After 27 Aug)
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Joel @itsjoels.bsky.social · 25/08/2026
This is the letter kids got at the end of Dolly’s Imagination Library. I defy you to read this and not cry.
Sorry, I can’t type that.
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 26/08/2026
Mathematician Katherine Johnson was born #OTD in 1918. Her orbital mechanics computations played a vital role in many early NASA missions. Astronaut John Glenn trusted her calculations more than those of his onboard flight computer. 🧪 🔭 👩‍🔬 Image: NASA
A black and white photo of Katherine Johnson sitting at her desk. She is wearing glasses and white or light dress with short sleeves and a collar. Johnson is looking to the right of the photographer. An analog adding machine sits on the desk in front of her, along with several papers and a translucent globe with multiple axes used for orbital calculations. She is holding a pen or pencil in her right hand, and wearing a bracelet or watch on her left wrist.
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Joseph Fasano @josephfasano.bsky.social · 24/08/2026
Back to school. ❤️
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Dr. Ryan T Johnson @ryantjohnson.bsky.social · 24/08/2026
cc @kkdumez.bsky.social
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Jamie @late2stuff.bsky.social · 19/08/2026
"AI adoption raises homework scores by 18% and reduces completion time by 30%, but lowers monthly exam scores by 20% within six months." papers.ssrn.com/sol3/papers....
papers.ssrn.com
The Generative AI Learning Penalty: Evidence from Chinese Secondary Education
Using 30 months of panel data on 26,811 Chinese students in grades 7-12, we study how generative AI affects homework productivity and learning. The data combine
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Fred Scharmen @sevensixfive.bsky.social · 18/08/2026
Fellow academics: when people ask you when class starts they are just making casual conversation you don’t have to be weird about it
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Aki Vehtari @avehtari.bsky.social · 13/08/2026
All four books I've co-authored are freely available online for non-commercial use: - Bayesian Workflow at avehtari.github.io/Bayesian-Wor... Links to other three books are in the quoted post 👇 (too many books to fit in one post!)
avehtari.github.io
Bayesian Workflow book: Website – Bayesian Workflow book
Website for the Bayesian Workflow book by Gelman, Vehtari, McElreath, et al. — case studies, code, and exercises in R and Stan.
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Season of Scaryanne Denton 🧡🎃 @mariannedenton.bsky.social · 12/08/2026
Happy Solar Eclipse Day to those who can celebrate!
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Jacob T. Levy @jacobtlevy.bsky.social · 09/08/2026
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Paul Cohen @paulecohen.bsky.social · 06/08/2026
the comparisons with Galileo that everyone is rushing to make are really interesting -- but not for the reasons that most people think the Galileo affair was not an instance of a heroic scientist falling victim to a an all-powerful Catholic Church monolithically committed to obscurity and dogma,
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ꭓle Ormsby 𓆙 @e-infinity.space · 04/08/2026
You know those viral fb posts that reduce to order of operations quibbling? Please deploy this associahedron-based interactive viewer in order to subvert those threads with interesting mathematics: kyleormsby.github.io/parse-explor... 🧮
parse tree for 9-3-3/3said trees arranged in the pentagonal associahedronparse trees for 6-9+7*7^23d associahedron view of those parsings
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Greg Egan @gregegansf.bsky.social · 27/07/2026
While the Fields Medal celebrates the under-40s, the mathematician Joan Birman has, at the age of 99, solved a major open problem in representations of the Braid groups, a topic she has worked on for more than 60 years.
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Elizabeth Jacobs, PhD @elizabethjacobs.bsky.social · 13/07/2026
Comments close at 11:59 PM tonight. For handy toolkit of how you can submit a comment, hit this link.
defendpublichealth.org
Critical action needed: Stop OMB's political review of federal grants | Defend Public Health
A proposed rule from the Office of Management and Budget (OMB) seeks to take expert review of federal grants out of the hands of experts and put it into the hands of political appointees. This rule co...
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Jonathan Howard @joho.bsky.social · 10/07/2026
The guy who claims he "would have" perfectly controlled COVID had he been in charge 6 years ago can't seem to do anything right now that he has power and an opportunity to dazzle us all with his competency and prowess.
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Daniel Swain @weatherwest.bsky.social · 08/07/2026
I just submitted my formal comment on the disastrous proposal to transform essentially all U.S. federal grantmaking--affecting every sector of American science, technology, education, & health--into an overtly partisan political process. Full text here: weatherwest.com/wp-c...
Screenshot of page 1 of my letter (see link in post for full text).Screenshot of page 2 of my letter (see link in post for full text).Screenshot of page 3 of my letter (see link in post for full text).Screenshot of page 4 of my letter (see link in post for full text).
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ACLU @aclu.org · 07/07/2026
BREAKING: A federal court permanently blocked Governor DeSantis’ classroom censorship law, the "Stop WOKE Act," from taking effect. The law would've restricted students and educators in Florida from discussing things like race and gender in higher ed classrooms.
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 01/07/2026
I hope after reading this you will all stop saying "integrate" and start gravely intoning "I invoke the sum over all small things." (5/n)
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North Carolina Conference of the AAUP @ncaaup.bsky.social · 26/06/2026
Defend Scientific Research, Defend Our Universities, and Defend Our Communities! AAUP NC Call to Action on Proposed OMB Rules and on UNC Institutional Neutrality Policy drive.google.com/file/d/1VtEm... Text follows 1/
Since taking office, the Trump Administration has instituted multiple changes that threaten funding for science in the US. Congress has pushed back, passing budgets that continue to provide strong support for the National Institutes of Health, the National Science Foundation, and other science agencies. In response, the Administration has sought to restrict and control science funding by other means. On May 29, Russell Vought, Director of the Office of Management and Budget, issued a set of proposed changes that would dramatically alter federal funding across the board, including funding for science. These sweeping changes would, among other things, reduce the role of peer review by making all grant decisions occur at the discretion of a political appointee, allow grant termination without cause, mandate that funding fit the “Administration's priorities” rather than being governed by scientific merit, seriously restrict foreign collaborations, and have other effects that will seriously damage the science enterprise in America. Similar rules will apply to all federal funding, from that for social science, the arts, and humanities to funding for programs that meet basic human needs.  Science magazine has a good summary of some of the most impactful changes. 

Of all the actions taken by the Administration with respect to federal funding, this is the most far-reaching and impactful. Scientific societies, including the American Association for the Advancement of Science, are mobilizing their members to respond. There is a straightforward mechanism for the public to comment. Former NIH program officer Elizabeth Ginexi has written an exceptionally helpful guide on how to do so, with detailed suggestions. She emphasizes the value of individual comments that address specific provisions rather than form letters, and gives details you will need to write and submit an effective comment. She offers examples for people at all career stages and for concerned members of the public…comments have already been received. To comment, visit this link, and then please click here to let us know. 

These changes, if implemented, would have dramatic effects on universities across our state. Federal funding, vetted by experts in the respective areas, underlies much of the research taking place across NC. In addition to individual comments, we need our universities to speak out publicly. However, the Institutional Neutrality Policy put in place by the Board of Governors prohibits UNC schools from speaking out publicly on issues like this that are existential threats to the university and its mission. Further, university leaders’ public silence demoralizes the researchers across the system who have committed their lives to scientific inquiry, and the communities whose lives depend on the fruits of up-to-date, peer-reviewed scientific research. Therefore, in addition to opposing the proposed OMB rules change, we call on the UNC Board of Governors, whose responsibility is to defend the UNC System and ensure that it can fulfill its mission, to eliminate this pernicious aspect of the current policy.

AAUP NC is working with scientists and other colleagues to defend higher education as a public good, and to prevent the politicization of science that these proposed OMB rules changes portend. We urge you to join us in this effort, and to spread the word among your colleagues and students.
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Bethany Brookshire @beebrookshire.bsky.social · 26/06/2026
YIKES: The OPM is proposing new NDAs for federal workers, this means scientists cannot talk about their work. They can't share their data, or talk to journalists. But it's still open for public comment! Comment by June 26. www.regulations.gov/search?filte...
regulations.gov
Regulations.gov
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Dr. Ryan T Johnson @ryantjohnson.bsky.social · 25/06/2026
I know many people with views like Alito. May Kagan's clear evidence inspire more of us to communicate like her.
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Brian Kaylor @briankaylor.bsky.social · 23/06/2026
Love this NY Times look at colonial Baptist preacher John Leland. Starts with some interactive art & then tells more of his story in helping the nation separate church & state: www.nytimes.com/interactive/...
nytimes.com
The Itinerant Preacher Who Helped Secure the Separation of Church and State (Gift Article)
For the 250th anniversary, the Times Magazine asked leading historians to profile founding-era Americans whose roles in the drama have been often overlooked.
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Jacob T. Levy @jacobtlevy.bsky.social · 23/06/2026
www.annualreviews.org/content/jour...
annualreviews.org
Conceptualizing Academic Freedom
Academic freedom is an unusual and complex set of norms and practices. It arises out of the combination of the corporate self-governance of medieval universities and the spirit of disciplinary scienti...
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This Is NOT Business As Usual @jemartisby.bsky.social · 19/06/2026
Happy Juneteenth! Here are some basic facts and history to revisit. Feel free to share!
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Phil Lewis @phillewis.bsky.social · 19/06/2026
I curated a (mostly) exhaustive list of Juneteenth celebrations across the country. Chances are there’s one near you!
whatimreading.net
Here’s a (mostly) exhaustive list of Juneteenth celebrations across the U.S.
Juneteenth marks the day when Union troops arrived in Galveston, Texas, to enforce the Emancipation Proclamation. I curated a list of events and one may be near you!
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Diana Butler Bass @dianabutlerbass.bsky.social · 19/06/2026
For Juneteenth: Make America safe for Democracy, Safe for black as well as other men; Hear us Father, We beg thee — Amen. — A prayer from poet Carrie Law Morgan Figgs, "Nuggets of Gold" (1921)
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AAUP @aaup.org · 15/06/2026
“We have shown that when the government tries to turn fear into policy, the AAUP will answer with law, with organizing, with solidarity, & with the oldest commitment we have: the defense of academic freedom for the common good.” 💥💥💥
Quote with picture of AAUP General Counsel Veena Dubal
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Annaliese Paulson @annaliesep.bsky.social · 12/06/2026
This is my number one piece of advice for doc students! I've been able to have genuine conversations with so many wonderful scholars by emailing them questions about papers I love.
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Tomer Ullman @tomerullman.bsky.social · 12/06/2026
starting another review and praying to Saint Lavigne (the Patron of Reviewers) for a good manuscript
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Michael Clemens @mclem.org · 09/06/2026
Which American benefited from this pointless cruelty? None. No Conservative, no Liberal. But it does degrade us, collectively.
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Andrew Heiss @andrew.heiss.phd · 09/06/2026
Just found this intriguing new function by Wadea Abu Dahoud for making a log-scale axis squiggly, mostly to act as a visual cue/speed bump that the axis isn't linear. github.com/wade31985-ar... #rstats #dataviz
Scatterplot showing acceleration time on the x-axis and logged price on the y-axis, with a squiggly y-axis to signal that it's loggedlibrary(tidyverse)
library(qatarcars)

ggplot(qatarcars, aes(x = performance, y = price)) +
  geom_point() +
  annotation_squiggled_log_y_axis(
    ymin = min(qatarcars$price),
    ymax = max(qatarcars$price),
    x0 = 0,
    amplitude = 0.3,
    linewidth = 0.35,
    base = 10,
    waves = 35,
    n = 4000,
    amplitude_power = 1.2,
    wave_power = 0.5
  ) +
  scale_y_log10(
    breaks = c(1e4, 1e5, 1e6, 1e7),
    labels = scales::label_currency(prefix = "QR "),
    expand = expansion(mult = c(0, 0.1))
  ) +
  labs(title = "Car performance and price for cars in Qatar") +
  theme_classic() +
  theme(
    axis.line.y = element_blank(),
    axis.ticks.y = element_blank(),
    plot.title = element_text(hjust = 0.5, face = "bold")
  )
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elizabethginexi.bsky.social @elizabethginexi.bsky.social · 29/05/2026
Summary of Key Changes in OMB’s Proposed Federal Financial Assistance Rule. Russell Vought is going destroy American Science. elizabethginexi.substack.com/p/summary-of...
elizabethginexi.substack.com
Summary of Key Changes in OMB’s Proposed Federal Financial Assistance Rule
Russell Vought is going destroy American Science
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Fintan Mallory @fintanmallory.com · 25/05/2026
THE POPE IS QUOTING GANDALF!!!
213. The twentieth-century Catholic author J.R.R. Tolkien, in the words of a protagonist in one of his novels, described our responsibility in this way: “It is not our part to master all the tides of the world, but to do what is in us for the succour of those years wherein we are set, uprooting the evil in the fields that we know, so that those who live after may have clean earth to till.”
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samuel mehr @mehr.nz · 12/05/2026
babe, wake up, new canonical regression discontinuity example just dropped
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ꭓle Ormsby 𓆙 @e-infinity.space · 04/05/2026
So, uh, really sorry folks, but I accidentally built an interdimensional portal this morning. If any loved ones go missing, they've probably been transported to a double cover of F₂ in the unit sphere of the quaternions.
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