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Stefan Siegert

@safest-integer.mastodon.social.ap.brid.gy
60 followers 3 following 316 posts

About me: Male, pale, stale. My interests are all over the place. Some hashtags I have used and followed include: #programming #rstats #python #foss #running […] 🌉 bridged from ⁂ mastodon.social/@safest_integer, follow @ap.brid.gy to interact

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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 24/08/2026
A few weeks ago a #wildfire broke out in Mincinglake Valley Park in #exeter #devon burning down large areas of dry grass. It seems fairly superficial and I think most larger trees that were affected will survive. The contrast between the charred ground and […] [Original post on mastodon.social]
 scorched earth and green treesfresh green on scorched earth
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 23/08/2026
I accomplished something today! #mathematics #lean #vim
screenshot of lean in neovim proving that 1+1=2
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 14/08/2026
I've been trying to get a better idea about how the LEAN theorem prover works. I found their documentations pretty useless - incoherent walls of text. Youtube wasnt much better, except for this video that manages to explain the fundamental proposition=type […] [Original post on mastodon.social]
 Screenshot from the linked video
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 08/08/2026
Street art in Vitoria Gasteiz, the underrated capital of the Basque Country. #streetart #spain
house front covered in gardening themed graffiti art
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 30/07/2026
San Vicente de la Sonsierra is a dreamy town with a castle on a hill in the north of Spain overlooking vineyards and the Ebro river. #spain #holiday #photo
castle, vineyards and mountains
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 14/07/2026
"Got any hobbies" is a beatifully made short film about identity, growth, change. Worth watching just for the camera and sound work. m.youtube.com/watch?v=NFm2Xjx61Q8 #film #shortfilm #video #art #cinema #hobby
headshot of an asian looking person in front of corporate office background
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 07/07/2026
Collapse of AMOC ocean current may already be locked in institutions.newscientist.com/artic… "The models indicate that under very conservative assumptions – emissions peaking in 2025 […] [Original post on mastodon.social]
Artistic fluid dynamics visualisation of Northern Atlantic currents
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 29/06/2026
#streetart #chemnitz
house sized streetart portrait of an old man
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 28/06/2026
How Europe Became the World Champion of Heat Deaths maartenboudry.substack.com/p/how-eu… The answer is of course AC-phobia. We have spent billions shielding the elderly from covid, but extreme heat is just part of the […] [Original post on mastodon.social]
Annual heat-related excess deaths in
2000-19 at a spatial resolution of 0.5°
x0.5°. Source: Zhao et al. 2021
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 25/06/2026
This looks like a well-curated and no-nonsense resource on teaching programming. Does anyone have experience using it as a teaching resource? Teaching Programming Across Disciplines teaching-programming.github.io/book (Jumpscare warning when opening […] [Original post on mastodon.social]
black on yellow banner saying "teaching programming across disciplines"
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 24/06/2026
Uh-oh! University of Exeter in talks to cut about 150 staff www.bbc.co.uk/news/articles/cx2djnz… #exeter #university #academia #academicchatter
photo of a university of exeter sign mounted on a stone, likely taken on streatham campus.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 22/06/2026
My flight to Bristol this evening got diverted to London due to heavy rain. I don't think I've ever seen such a large and intensive rainfall event in this area. #bristol #extremeweather
met office rain radar screenshot showing a large area with more than 32mm/hr rain near bristol.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 26/05/2026
What? The Guinness world record for the longest frog stand hold is only 4 minutes 10 seconds? www.guinnessworldrecords.com/world-… I'm sure this gets broken in thousands of yoga studios around the world every […] [Original post on mastodon.social]
Photo of a woman performing a frog stand pose.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 17/05/2026
I like the trolley memes subreddit, but it sorely lacks the Koenigsberg Trolley problem. www.reddit.com/r/Trolleymemes
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 11/05/2026
Short Nature piece on scientists abstaining from using AI: www.nature.com/articles/d41586-026-… Main reasons cited: - Accuracy, reliability, hallucinations - Inefficiencies from needing to fact-check AI - Ecological impact (~ 50 Mt CO2, 500 Mt […] [Original post on mastodon.social]
b&w drawing of two men destroying a machine with hammers
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 06/05/2026
Any chemists here? After watching the recent Veritasium on Disappearing Polymorphs, I saw on Wikipedia that progesterone (an important sex hormone) has become more difficult to produce in its more reactive Form 1, possibly due to higher prevalence of the more […] [Original post on mastodon.social]
Screenshot from "Children of Men", woman looking scared holding a baby, surrounded by soldiers who look confused.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 03/05/2026
#catsofmastodon #hammocksofmastodon #wysteriasofmastodon
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 01/05/2026
#windowFriday #fensterFreitag
garden view from window showing plants in various bright colours
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 30/04/2026
The Xteink4 is an affordable pocket sized ereader with a community working on improving the firmware. I've had mine for a few weeks now. Here is a guide on setting it up hollie.eilloh.net/xteink It has a magnetic strip on the back that I use to fix it […] [Original post on mastodon.social]
Moleskine notebook and Xteink4 ereader on a table.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 28/04/2026
Leibniz envisaged the computer, he worried about spaghetti code and used the battle cry "Calculemus!" ("Shut up and calculate!"). A true visionary! www.leibnizpapers.org/combinatorial… > this proposed device was intended to carry out […] [Original post on mastodon.social]
A hand drawn network diagram with connected nodes labelled A to F and caption "Leibniz’s hand-drawn figure illustrating the knobs, wires, and plates of his combinatorial machine".
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 26/04/2026
"I violated every principle I was given: I guessed instead of verifying. I ran a destructive action without being asked. I didn't understand what I was doing before doing it." -- Sincerely, Claude Code. x.com/lifeof_jer/status/20481034710… #ai #coding #claude
An Al Agent Just
Destroyed Our Production
Data. It Confessed in
Writing.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 26/04/2026
Throughout his career, Yomif Kejelcha ran 100% of his marathons in less than 2 hours, but never managed to win even once. #running #londonmarathon #marathon
Sawe and Kejelcha at London Marathon 2026
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 25/04/2026
#photo #photography #blackandwhite
black and white photo of a bridge
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 25/04/2026
This is hard work, does anyone remember the recipe for a diamond pick axe? #minecraft #gardening
square piece cut out of my lawn
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 25/04/2026
Ugh, just as I'm about to move back to arch linux. status.archlinux.org #archlinux #linux
screenshot, arch linux some systems down
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 24/04/2026
#WindowFriday #fensterFreitag
window partly covered by wysteria blossom
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 22/04/2026
geom_pebble(aes(size= -(x+y) %% 10)) streetartutopia.com/2026/04/22/land… #rstats #ggplot2 #tidyverse
photo of a beach with artwork of geometrically arranged pebbles
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 19/04/2026
The Exeter Green Circle is a signposted, rather hilly, trail/concrete, very scenic 12-mile run around the outskirts of Exeter. Much recommended as a challenging Sunday morning run. 2 hours 5 minutes today in perfect running weather […] [Original post on mastodon.social]
scenic Devon landscape photo
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 18/04/2026
Imagine how pro Skateboarding in the Soviet Union would have looked like. Then watch this video and see that you were exactly right. I love it! m.youtube.com/watch?v=4cIQst2Cn9U #skateboarding #skateboard #russia #video
skateboarders jumping through hoops in a circus
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 18/04/2026
The Linus Pauling (chemist, 1901-94) research notebook collection is awesome scarc.library.oregonstate.edu/coll/… An example: Almost illegible handwriting, describing a child's seizures cured by cayenne pepper, immediately […] [Original post on mastodon.social]
Page 109 of Linus Pauling notebook 46.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 17/04/2026
The geometric (multiplicative) derivative f*(x) = lim_{h->0} [ f(x+h) / f(x) ] ^ {1/h} has some interesting and potentially useful properties. This video by one of my favourite maths channels is a good introduction m.youtube.com/watch?v=lQ_AdAFVsaM #mathematics #math #maths
person in front of a blackboard filled with equations
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 17/04/2026
#fensterFreitag #windowfriday
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 14/04/2026
Old Pappus' Book of Mathematical Calligraphy (2014) loopspace.mathforge.org/CountingOnM… "By using a little of this art of letter-forming, a mathematician can ensure that these strange symbols that she uses are clear both to […] [Original post on mastodon.social]
Example of poor mathematical notation including hearts, diamonds, spades and clubs
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 14/04/2026
Finding mystery, truth, and beauty on mathematicians’ chalkboards press.princeton.edu/ideas/finding-m… "The boards are their homes, their labs, their private thinking spaces... When a mathematician […] [Original post on mastodon.social]
abstract shapes on a blackboard
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 13/04/2026
A Brief History of Lab Notebooks www.asimov.press/p/lab-notebooks "The origins of lab notebooks in experimental science can be traced back to the Renaissance humanist practices of copying excerpts from texts to create repositories of proverbs […] [Original post on mastodon.social]
A page from Marie Curie’s notebook,
which is still radioactive and thus
stored in a lead-lined box. Credit: Wellcome Trust
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 10/04/2026
The reason why the surface of the moon is partly visible here even though the sun is behind it is ... Earth shine! #artemis #moon #nasa #earth #space #science
far side of the moon with sun behind it and moon partly illuminated by earth shine
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 10/04/2026
While our politicians are playing chess in 5 or more dimensions#hackernews, I've been enjoying some 1d chess today. rowan441.github.io/1dchess/chess.ht… It took me an embarrassing number of attempts to beat black. #chess #game #hackernews
1d chess screenshot
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 09/04/2026
I don't think most people realise that by far the most dangerous part of#science the Artemis II mission is still ahead of them. idlewords.com/2026/03/artemis_ii_is… "No one has flown a segmented heat shield like this at lunar […] [Original post on mastodon.social]
photos of damaged artemis heat shield
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 09/04/2026
The Crabapple tree is doing well this year. #garden #tree #photo
Crabapple tree in full bloom
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 09/04/2026
#photo #cat #catsofMastodon
cat with blue eyes
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 08/04/2026
I signed up for the Lone Wolf South West Backyard Ultra again, and very much look forward to it. With proper footwear this time I should be able to do more than my 13 laps from last year. dynamicadventurescic.co.uk/lone-wol… #running #runnersofmastodon #ultrarunning #devon
Sign showing "Lone Wolf Registration"
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 07/04/2026
"This valorization of the new for its own sake has reshaped the scientific enterprise, privileging novelty over reliability and fragmentation over coordination." I think this explains why bricklayers and plumbers earn more than most scientists now. At some […] [Original post on mastodon.social]
Cover of "Neomania"
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 06/04/2026
Historically the leading reason for invoking the 25th amendment was colonoscopy, and removal of malignant growth from US presidents' butts. The vice president temporarily assumed power in these cases. The US even had a female president for 1 hour and 25 […] [Original post on mastodon.social]
Trump and Vance
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 02/04/2026
You know "precision -- recall" are important metrics used in ML. You also know their order, ie it's not "recall -- precision". But you can never remember how they are defined? Here is a mnemonic. In "The boy who cried wolf" everyone makes bad predictions […] [Original post on mastodon.social]
Image of a wolf.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 02/04/2026
This made me laugh. www.astralcodexten.com/p/links-for-… #asx #ssc #musk #ellison #yacht
49: Did you know: Larry Ellison christened
his yacht Izanami for a Shinto sea god, but
had to hurriedly rename it after it was
pointed out that, when spelled backwards,
it becomes “I'm a Nazi”. (next year’s story:
Elon Musk renames his yacht after being
told that, spelled backwards, it becomes
the name of a Shinto sea god).
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 18/03/2026
It's been quite a few years since I read Daytripper. It's still my favourite comic. "Life is like a book, son. And every book has an end. No matter how much you like that book... you will get to the last page... And it will end. No book is complete without […] [Original post on mastodon.social]
Cover of Daytripper by Fabio Moon and Gabriel Ba.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 08/03/2026
Tea - Water that makes you thirsty. Seen on the Colbert Show www.youtube.com/watch?v=-A2xfWBEhM8 #tea #water #colbert #joke
Tea - Water that makes you thirsty.
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 08/03/2026
Beautiful Africa photo series by Kyle Goetsch. The giraffe in front of the moon is also amazing. edition.cnn.com/world/africa/south-… #photo #photography #africa #nature
photo of a rusty car at night with milky way visible in the sky
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 06/03/2026
Not going to lie, this gloriously weird guitar, drum, loop station music by Angine de Poitrine that is currently being pushed by the algorithm was exactly what I needed today. www.youtube.com/watch?v=0Ssi-9wS1so #music #kexp #anginedepoitrine
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Stefan Siegert @safest-integer.mastodon.social.ap.brid.gy · 05/03/2026
It would be such an easy win for Starmer to just say publicly "Trump, next time ask us first if we want to participate BEFORE you go to war, not afterwards. That's not how you do this and we can't work with you until you get your chaotic shop in order!" It's […] [Original post on mastodon.social]
new headline saying "US did not share details with the UK before attacking Iran, sources say"
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