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Stephen Sekula

@steve.mastodon.cooleysekula.net.ap.brid.gy
113 followers 29 following 1.2K posts

Particle #Astrophysics researcher, #SNOLAB Research Group Manager, #Professor of #Physics at Queen's University. I live and work in #Sudbury, #Ontario […] 🌉 bridged from ⁂ mastodon.cooleysekula.net/@steve, follow @ap.brid.gy to interact

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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 4h
@brianvastag That's right! After the pandemic when our University reopened to in-person classes, I blasted the "Back to School" theme song on the way to the first day of classes. Good stuff.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 5h
It has been lovely to reconnect with #MadisonWI, the first place I fell in love with as I began my journey into professional #physics. This place transformed me and gave me a chance to be better.
Madison seen from a nature trail across Lake MendotaThe Wisconsin State Capitol buildingThe (in)famous Humanities Building at UW-MadisonA view of the totally transformed East Washington area of Madison, which was mostly disused industrial zoning when I was a graduate student.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 5h
@jodi and I were very excited to be able to honour Dr. Francis Halzen at a reception to celebrate his 2026 Nobel Prize in Physics. It was a particular joy to share this celebration with our nephew (at right), who is an undergraduate at #UWMadison […] [Original post on mastodon.cooleysekula.net]
From right to left: our nephew, Dr. Francis Halzen, Jodi, and me.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 11/10/2026
Earlier this year, while working on my next book ("Light and the Dark Cosmos") I suddenly found myself technically way out of my depth on the use of galaxy brightness and redshirts to measure the expansion of the universe. At nearby distances, like […] [Original post on mastodon.cooleysekula.net]
A book cover art concept showing a bright accretion disk swirling around a central black hole.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 11/10/2026
We are taking vacation in Wisconsin this week, our usual "late September vacation" delayed by work commitments until this week. We are excited to visit family, especially our nephews who started university this fall at our alma maters. It will be […] [Original post on mastodon.cooleysekula.net]
A view of a field from a Wisconsin country road
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 10/10/2026
Seeing some amazing fall colours out here today in #Ontario!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 10/10/2026
Had a lovely walk last evening in the chill autumn weather. Very grateful for that after an exciting and busy week. #Sudbury
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Reposted by Stephen Sekula
SNOLAB @snolabscience.bsky.social · 09/10/2026
Both SNOLAB and SNOLAB Executive Director Jodi Cooley have very close ties to the 2026 Nobel Prize in Physics winner Francis Halzen and the IceCube experiment. Learn more about IceCube, SNOLAB and about the power of positive mentorship in the sciences here: www.snolab.ca/.../snolab-h...
snolab.ca
SNOLAB has deep connections to Nobel Prize winner | SNOLAB
(SUDBURY) The decision by the Royal Swedish Academy of Sciences to award the 2026 Nobel Prize in Physics to Francis Halzen did not come as a surprise to SNOLAB Executive Director Jodi Cooley.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 09/10/2026
I’ve put together a short playlist of videos on #PeerTube that are from my catalogue of course and public lecture materials in physics. The 4 videos have some relevance to the Physiology/#Medicine (light and cell ion currents), #Physics (neutrino astronomy), and #Chemistry (symmetry) prizes […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 08/10/2026
Sharing this from @SNOLAB over on LinkedIn. "Wonderground at SNOLAB is back! We are kicking off another season of hands-on learning and scientific inquiry, and we're looking for Grades 4-8 teachers from across Canada to join us. Give your students […] [Original post on mastodon.cooleysekula.net]
Wonderground at SNOLAB is back! We are kicking off another season of hands-on learning and scientific inquiry, and we're looking for Grades 4-8 teachers from across Canada to join us.

Give your students the chance to get curious, ask big questions, and experience what it's like to think and work like a scientist.

Interested and want to learn more? Check our website here
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 08/10/2026
ABSOLUTELY STUNNING rainbow this evening in #Sudbury! Look at that colour substructure below the primary inner rainbow!
A stunning double rainbow
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 08/10/2026
Had a good time supporting the #PICODarkMatter team yesterday as we continue building PICO-500. A PhD student from #QueensUniversity started training a new colleague on the photomultiplier tube testing plan for our muon shield. I got my first view […] [Original post on mastodon.cooleysekula.net]
A view up into the vertical pressure vessel, highlighting the retroreflectorA demonstration of the photomultiplier tube testing and, eventually, calibration station.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 07/10/2026
Going to try to watch as much of the #Chemistry #NobelPrize announcement as I can before I need to head to SNOLAB for my underground lab shift today.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 06/10/2026
Boom. It was a wonderful morning. for sure. Very gratifying to see him honoured.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 06/10/2026
I like University of Wisconsin-Madison's LinkedIn post about today's #NobelPrize in Physics. Simple. To the point. lnkd.in/p/gdRGtPAH
linkedin.com
The Nobel Prize for a Badger 🏅 Congratulations to Francis Halzen, UW–Madison professor of physics and principal investigator of the National Science Foundation (NSF) IceCube Neutrino Observatory… | University of Wisconsin-Madison | 111 comments
The Nobel Prize for a Badger 🏅 Congratulations to Francis Halzen, UW–Madison professor of physics and principal investigator of the National Science Foundation (NSF) IceCube Neutrino Observatory, on being named the 2026 Nobel laureate in physics. His work helped unlock new ways of understanding the universe and the particles known as neutrinos. Learn more about his groundbreaking work: https://lnkd.in/eZzNCU2F | 111 comments on LinkedIn
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 06/10/2026
A new article from Ivan Semeniuk at the #GlobeAndMail discusses today's #NobelPrize in #Physics and provides some @snolabscience.bsky.social and Canadian perspectives […] [Original post on mastodon.cooleysekula.net]
A screenshot of the top of the article about Dr. Halzen's Nobel Prize in Physics
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 06/10/2026
A lovely quote from Dr. Francis Halzen, reposted from LinkedIn. lnkd.in/p/gYSX4bCg
"I hope this reflects on the really courageous people who joined me in the beginning of this project when no respectable conservative physicists would have joined me, but many talented people did, and that's why I'm here."”

- Speaking at today's prize announcement, Francis Halzen says the most rewarding part of being awarded the 2026 Nobel Prize in Physics is recognising the people who have worked alongside him.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 06/10/2026
My PhD alma mater, UW-Madison, has a long history of connection to #NobelPrizes spanning the categories. Bardeen is the only person to have won two Nobel Prizes in Physics. It has been 26 years since the last Madison-connected #physics prize. Nobel Prize Awardees - University of […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Reposted by Stephen Sekula
SNOLAB @snolabscience.bsky.social · 06/10/2026
Congratulations to Francis Halzen from the team at SNOLAB! The 2026 #NobelPrize in #Physics has been awarded to Francis Halzen “for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.”
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 06/10/2026
Congratulations to our former professor and mentor Dr. Francis Halzen for being named the sole recipient of the 2026 #NobelPrize in #Physics. Many a hug and cry of joy was had in our house this morning upon hearing this news! Learn more from my […] [Original post on mastodon.cooleysekula.net]
A card indicating Dr. Halzen is awarded the prize for decisive contributions to the IceCube Neutrino Observatory and for the discovery of high-energy neutrinos of astrophysical origin.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/10/2026
Good morning #Sudbury!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/10/2026
Some reflections from a physicist on the 2026 #NobelPrize in Physiology or Medicine. "This prize is essentially awarded for the discovery of a specific protein sensitive to light, and the subsequent deployment of the protein (via genetic expression in specific cells, cell groups, or cell types) […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/10/2026
Press release: Nobel Prize in Physiology or Medicine 2026 - NobelPrize.org www.nobelprize.org/prizes/medicine/…
Screen capture of graphic about Nobel Prize in Physiology or Medicine.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/10/2026
It’s #NobelPrize week! … which means getting up early (not as early as when I lived in Texas), drinking coffee, and watching the Nobel Prize live streams of the science prize announcements! I am not live-blogging the Medicine/Physiology prize […] [Original post on mastodon.cooleysekula.net]
A TV showing a live stream
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/10/2026
University of Toronto launches new PhD fellowship program aimed at paying students up to $80,000/year to engage in interdisciplinary research themes. www.theglobeandmail.com/gift/3c21ef… (gift link)
theglobeandmail.com
University of Toronto launching $100-million scholarship fund to attract PhD students
New program aims to help school compete for bright minds at a time when elite U.S. universities are under attack by the Trump administration
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Reposted by Stephen Sekula
Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
More wild speculation fuel for the upcoming #NobelPrize in #Physics: steve.cooleysekula.net/blog/2026/09… Join me in the live blog on Tuesday morning for commentary on the ceremony and the award!
steve.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 04/10/2026
Learn more bout the work being done at @snolabscience.bsky.social and, at experiments across the globe, to map #neutrinos from deep within the Earth. The same nuclear reactions that have kept the Earth warm for a very long time also radiate neutrinos. They are the one known particle that can […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 04/10/2026
This batch got planted when my niece visited in July. so this is about the earliest I could have harvested. I will be bringing the plants indoors for the winter to try to get more from the same plants.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
More potatoes! 🥔 🥔 🥔 The second plant seemed amenable to replanting, so if I did a good job I should get more potatoes in 90 days or so. #gardening
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
I agree. Chances are probably low, but let's see.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
More wild speculation fuel for the upcoming #NobelPrize in #Physics: steve.cooleysekula.net/blog/2026/09… Join me in the live blog on Tuesday morning for commentary on the ceremony and the award!
steve.cooleysekula.net
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Reposted by Stephen Sekula
Mastodon Engineering @mastodonengineering.mastodon.social.ap.brid.gy · 01/10/2026
We just released Mastodon v4.7.3, v4.6.9, v4.5.19 and v4.4.26. They contain many bugfixes in addition to updating some of our dependencies to fix security issues in those. We recommend administrators to update when they can. Full release notes and update instructions are available on the […]
mastodon.social
Original post on mastodon.social
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/09/2026
The 2026 Nobel Prize in Physics [Live Blog] I am again live-blogging reactions to the announcement of the Nobel Prize. Join me early on the morning of October 6 (EST) for the announcement and some reactions! steve.cooleysekula.net/blog/2026/09…
steve.cooleysekula.net
The 2026 Nobel Prize in Physics [Live Blog]
I am again live-blogging reactions to the announcement of the Nobel Prize. Join me early on the morning of October 6 (EST) for the announcement and some reactions!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/09/2026
Fediversing the 2026 Physics Nobel Prize Last year, I turned the awesome power of the open federated social web, or fediverse, onto the question of the subject of the Nobel Prize in Physics. I did it with a poorly constructed poll, which predicted that the winning category would be in the […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 29/09/2026
Harvested the first potatoes today from the smallest plant that resulted from a potato-planting frenzy with my niece back in July. More potatoes to come!
Two potatoes harvested from a plant
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Reposted by Stephen Sekula
Mastodon Engineering @mastodonengineering.mastodon.social.ap.brid.gy · 23/09/2026
We are aware of an ongoing wave of subscription spam throughout the fediverse. We are investigating avenues to mitigate this, but they will likely involve deep changes in the sign-up flow that may break sign-up from existing applications. In the meantime, you can find helpful resources at […]
mastodon.social
Original post on mastodon.social
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 19/09/2026
I had a fantastic time this morning working at the #SNOLAB booth at the annual Anderson Farm fall fair in Lively. It was great to be able to meet lots of people, including community members who helped build the original SNO Experiment and SNOLAB, and share @snolabscience.bsky.social. Thanks […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 19/09/2026
Good morning, #Sudbury!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 18/09/2026
I had to shut off the "newsletter" feature on my #Mastodon instance because of a spam or bot attack that used fake email accounts to try to subscribe to accounts on the system. This led to a flood of bouncing emails outgoing from the mail server, which I do not like. Until #Mastodon is able to […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 17/09/2026
Oof. That was a harrowing #PeerTube version upgrade. But, IT IS DONE.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 15/09/2026
@davidho.bsky.social Brutal reduction in scientific investment. Just brutal.
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FediForum @fediforum.mastodon.social.ap.brid.gy · 15/09/2026
Three weeks to FediForum, the online unconference to move the Open Social Web forward. More info and registration: fediforum.org
fediforum.org
FediForum
FediForum: moving the Open Social Web forward
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Reposted by Stephen Sekula
SNOLAB @snolabscience.bsky.social · 15/09/2026
www.thesudburystar.com/news/mission...
thesudburystar.com
Mission Unstoppable shines light on SNOLAB’s groundbreaking science
Deep beneath the surface of the Earth in Sudbury, SNOLAB scientist Erica Caden explains why solar neutrinos are playing hard to get.
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Reposted by Stephen Sekula
Mastodon Engineering @mastodonengineering.mastodon.social.ap.brid.gy · 15/09/2026
We just released Mastodon v4.7.2, v4.6.8, v4.5.18 and v4.4.25. In addition to several bugfixes, they disable HEIF processing to avoid a known critical security issues. We encourage server administrators to update as soon as possible. Full release notes and update instructions are available on […]
mastodon.social
Original post on mastodon.social
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 15/09/2026
RE: mastodon.cooleysekula.net/@steve/11… ONE HOUR LEFT! What broad topic area do YOU, THE #FEDIVERSE, believe will be the subject of the 2026 #NobelPrize in #Physics? Vote now, and I'l STOP. USING. ALL. CAPS. AND. STOPS.
mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 13/09/2026
It has been a really windy weekend. Has felt like something is making its way toward us. Well, here it comes, #Sudbury!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 13/09/2026
Looking for some help, specifically people interacting with #PeerTube instances. I have noticed in the last 24 hours that I cannot subscribe to content on makertube.net. I am hoping this is just a problem with my instance, but if someone could try following an account there (like kevinmakes or […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Reposted by Stephen Sekula
Mineralogical Society of America @mineralsocamerica.bsky.social · 12/09/2026
Mineral Cup: Round 1 match 12: www.mineralcup.org/2026/vote-results/vote-r1m12
mineralcup.org
Vote in Round 1 Match 12 — Mineral Cup & Ore Cup
Vote in Pyrrhotite vs Cylindrite Credit:
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 13/09/2026
Got storms rolling in to #Sudbury.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 12/09/2026
RE: mastodon.cooleysekula.net/@steve/11… Well, the community has just 3 days left to participate in my extraordinarily unscientific poll to see what the #fediverse thinks might be the topic area of the 2026 #NobelPrize in #Physics. Last year, the community was […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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