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Joana de Castro Arnaud

@jcastroarnaud.bsky.social
101 followers 116 following 354 posts

Uma pessoa simples, com umas ideias muito complicadas. Mulher trans. Programadora de computador. Fã de ciência e matemática. Escritora amadora. Criadora de jogos amadora. Curiosa sobre um bocado de coisas. Posts em português and/or English.

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Reposted by Joana de Castro Arnaud
Mike Sowden @mikeachim.bsky.social · 12/10/2026
REMINDER IN THE BLISSFUL PEACE OF A PARTIALLY DE-BOTTED INTERNET: When angry randos with no profile picture start yelling abuse at you on social media, they usually want one thing from you: DESPAIR. "Oh god, the world is full of hateful idiots & we're all doomed!!!" And yet... 1/
static.klipy.com
Nicolas Cage's Iconic Smile in The Rock
ALT: Nicolas Cage's Iconic Smile in The Rock
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Tim Chartier @timchartier.bsky.social · 11/10/2026
Plato associated the tetrahedron with fire. I made it ice. 🧊🔥 The simplest Platonic solid: just 4 triangles, each one's corners chasing each other inward, then letting go. A quiet one for Sunday. #generativeart #mathart #creativecoding
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𝐃𝐚𝐦𝐢𝐞𝐧 @mulletsandmonsters.bsky.social · 04/11/2024
Some worldbuilding of mine: I always thought that the Bell Telephone would be the perfect design for anthros to use, so I decided that’s the one that stuck in my world! Here’s a little thing I did showing that off back in 2022. #art #furry #furryart #worldbuilding
An illustration depicting how phones for anthros would be in my worldbuilding. The Bell phone design is the one that stuck, as it works with various mouth and ear distances across species!

Depicted at the bottom is a rabbit woman at home using her phone.

At the top, we see some diagrams featuring a dog and an anteater to demonstrate how the standard phone handset doesn’t work as well as the Bell style.

There are also some sketches of more modern takes on the Bell Phone.
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William Shakespeare @shakespeare.lol · 12/10/2026
Make space enough between you.
A license plate that says: “KER NING”
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
O Governo Federal tem tido pouco dinheiro para investir. Flávio Bolsonaro diz que quer fazer mais investimentos, e ao mesmo tempo pretende cortar impostos. A conta não fecha. E a diferença vai sair de reduções nos serviços públicos; quem vai sair perdendo é o povo. Vote #Lula. #eleicoes2026
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Reposted by Joana de Castro Arnaud
Chise @sailorrooscout.bsky.social · 09/10/2026
How Vaccines Work 🧬🧫🧪🔬💉🥽
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
Pressione seu deputado ou senador preferido, encha o saco dele! Você ajudou ele a chegar no poder, então ele tem mais é que votar como você manda! Aqui os contatos: www.camara.leg.br/deputados/qu... www25.senado.leg.br/web/senadores #politica #congresso #eleicoes2026
camara.leg.br
Quem são os deputados federais - Câmara dos Deputados
Busque um deputado, conheça e acompanhe seu trabalho
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
Seu deputado ou senador não te responde quando você liga ou manda e-mail? Não vota do jeito que você quer? Mande-o à merda! Na próxima eleição, não vote nele nem no partido dele. Se ele for do #PL, vote no #PT, só pra ser do contra. #politica #congresso #eleicoes2026
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
Sabia que você pode entrar em contato com seu deputado ou senador? Procure nos sites da Câmara e do Senado, que você encontra endereço, telefone e e-mail. Veja aqui: www.camara.leg.br/deputados/qu... www25.senado.leg.br/web/senadores #politica #congresso #eleicoes2026
camara.leg.br
Quem são os deputados federais - Câmara dos Deputados
Busque um deputado, conheça e acompanhe seu trabalho
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
Sabia que você pode ver em que os políticos estão trabalhando? Procure nos sites da Câmara e do Senado, que lá tem os projetos de lei sendo discutidos. Veja aqui: www.camara.leg.br/busca-portal... www25.senado.leg.br/web/atividad... #politica #congresso #eleicoes2026
camara.leg.br
Portal da Câmara dos Deputados - Busca
Busca do Portal da Câmara dos Deputados
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
#Vote para presidente nestas #eleicoes2026 ! Mesmo que você não goste de nenhum dos candidatos, vote naquele que você acha que vai perder. Se você não votar, ou anular seu voto, é menos um voto que o vencedor precisará para se eleger. Não votar facilita o trabalho desse político que você odeia!
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 10/10/2026
Vote em #Lula para presidente nestas #eleicoes2026 ! As propostas de Flávio Bolsonaro causarão muito mais dano, ao Brasil e aos brasileiros, do que as propostas de Lula. Compare as propostas, reflita e decida! Lula: www.tse.jus.br/eleicoes/ele... Flávio: www.tse.jus.br/eleicoes/ele...
tse.jus.br
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 09/10/2026
Frase vista em camiseta: "Se eu tomar calmante, o calmante é que fica puto". A saying on a T-shirt (translated): "If I take a sedative, the sedative will rage". #humor #shirt
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 09/10/2026
Um rébus: tô💩e🚶. Se você não entendeu, tô💩e🚶. 😜 #humor #joke #rebus
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Somos Todos SUS @somostodossus.bsky.social · 06/10/2026
Flavio Bolsonaro é contra o fim da escala 6x1!
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Dave Richeson @divbyzero.bsky.social · 05/10/2026
I wanted to see how my calculus students could do creating a closed piecewise parametric curve for an impossible object. They made one side and could choose one of my shapes for the other side. Then I printed the objects. It went well, and I think I can ramp it up a little bit and
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Mike Sowden @mikeachim.bsky.social · 22/09/2026
In all the grandiose discussion about colonising Mars, I don't see much about how the soil is poisonous to us. This was only discovered in 2008. It contains perchlorates, which are environmental toxins here on Earth. Any human contact with Mars dust? Super-bad news in the long run. 1/
NASA image from the surface of Mars, showing its red dusty surface with rover tire-tracks running across it.
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 12/09/2026
Será que a Sorte se esconde aqui? #fotografia #trevo #sorte #arte #photography #clover #luck #art
Um grupo de trevos cresce no chão, formando um mini-arbusto. Uma legenda, embaixo, diz: "Será que a Sorte se esconde aqui?"
A group of clovers grows up on the ground, making up a tiny shrub. A caption, below, says: "Wonder if Luck hides here?"
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𝕯𝖆𝖓🍂🎃🕸️ @arepublic86.bsky.social · 05/09/2026
Charlotte Wainwright restoring and saving old/ancient books. www.wainwrightbookbinding.com
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🅺🅴🅴🆂🅷.work🏳️‍🌈💜 24/7 Plompy 🔜Infurnity 2026 ⏭️JMoF 2027 @keesh.work · 12/09/2026
chinchilla girlie #furry #furryart
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Dave Richeson @divbyzero.bsky.social · 02/09/2026
A hyperbolic one-handed clock. You can see hours, minutes, and seconds. jpivarski.github.io/hyperbolic-m...
jpivarski.github.io
One-handed clock — hyperbolic-map
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Dale Chapman @dalechapman.bsky.social · 03/09/2026
As we begin our first lessons of the year I have used this for a few years as my first lesson activity. I absolutely love it. There's something about the way it seems impossible on first sight but as you work through it gets easier and easier that I love. nrich.maths.org/problems/sha...
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Elle Cordova @ellecordova.bsky.social · 03/09/2026
Rough Draft vs Final Draft
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arielle!✨fantastic knickknackery @arielleishere.bsky.social · 22/08/2026
wood d12s!! each one has 12 pretties that i drew with my human brain and hands!! these take a really long time and LOTS of focus to engrave (i gotta make sure i keep all the sides in the right spots!!) and i'm REALLY PROUD of them!!!!! why not buy one or five? ariellemilstein.com/dice
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Mr. Edtropolis @edtropolis.bsky.social · 15/07/2026
It's @foxpopvli.bsky.social's Patty again, this time advertising wearing sandals...you know to protect those grippers when it gets hot... 🦊👀
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Elizabeth Jacobs, PhD @elizabethjacobs.bsky.social · 18/06/2026
RFK Jr. says that HPV vaccine is “dangerous and defective”. A new study from England shows that HPV vaccines have reduced deaths from cervical cancer to ZERO for women aged 20-24. Significant reductions in older age groups were observed as well, though the latter have lower vaccination coverage.
thelancet.com
Cervical cancer mortality trends following HPV vaccination in England, 2001–24: an analysis of population-based mortality data
Our findings provide the first robust national-level evidence, albeit observational, that high HPV vaccination coverage is associated with a substantial reduction in cervical cancer deaths. This is sh...
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 12/06/2026
A trans woman, not quite #passing, is at a café. She wears a off-the-shoulder top, showing bare shoulders and bra straps. Someone: "Your bra strap is showing." Trans woman: "I know. It's a reminder to everyone that I'm a woman." #BraStrapMeme #Trans #TransWomenAreWomen
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Cabel Sasser @cabel.panic.com · 07/06/2026
Here's an easter egg in the new Lego Batman that I think all of you will REALLY appreciate. It's so good, I had to make a video.
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purr.in.ink @purrinink.bsky.social · 07/06/2026
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Cubes_Art @cubesart.bsky.social · 31/05/2026
Very nice problem! I appreciated it so much that I constructed the figure in Desmos ** SPOILER ALERT! ** www.desmos.com/calculator/l...
desmos.com
Catriona's Hexagon & Triangle
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Luca @lucagalletti.bsky.social · 30/05/2026
Amazing imaginative photography by Spanish duo Anna Devís and Daniel Rueda. TT: ClawClips
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Eddie Selover @eddieselover.bsky.social · 30/05/2026
Timeline cleanse
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Jan Rosenow @janrosenow.bsky.social · 19/05/2026
The world’s largest sand battery got through Finland’s harshest winter in years. 2,000 tonnes of sand, heated to 500-600°C by cheap power, feeding district heating in Pornainen. And it worked. Result from one install: oil down 100%, emissions down 70%. Industrial process heat is the real prize.
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Maths.scot @maths.scot · 11/05/2026
Utter drivel from BBC News: www.bbc.co.uk/news/article... Here are the published “command words”: www.maths.scot/pdf/h/sqa/NQ... Here is the relevant exam paper: www.maths.scot/pdf/h/past-p... Every command word in the paper is listed in the command words document.
bbc.co.uk
Pupils hopeless and crying after 'poorly worded' Higher Maths exam
More than 11,000 people have signed a petition calling for a review of the exam saying it was
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Chise @sailorrooscout.bsky.social · 06/05/2026
Guys. Heads up. Let’s talk about Hantavirus. There have been SEVERAL bad takes and BLATANT misinformation circulating regarding this outbreak so I figured it was a good idea to make a thread about it. Stay calm. Stay vigilant. Know your facts. Here’s ALL you need to know. 🧪🧵⬇️
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Valeriy M., PhD, MBA, CQF @predict-addict.bsky.social · 30/04/2026
In 1703, Leonty Magnitsky published a book that would shape Russian mathematics for generations. The book was Arithmetic (1703).
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LaurenWalshArt @laurenwalshart.bsky.social · 30/04/2026
I Don’t Need An Ai Summary Of An Email I Can Just READ The EMAIL
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Merriam-Webster @merriam-webster.com · 30/04/2026
Hippopotomonstrosesquippedaliophobia is the fear of long words, which feels a bit passive-aggressive.
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Daniel Bellingradt @dbellingradt.bsky.social · 22/04/2026
You see a Dürer-drawn celestial chart: an analog computer from the early sixteenth century. Have a seat, and enjoy this short paper instrument's 🧵 for #skystorians and more:
A Dürer-drawn celestial chart on a broadside with text and image parts. The image part looks like long lines travelling.
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Adam Keiper @adamkeiper.com · 22/04/2026
Hegseth's announcement that service members are no longer required to take the flu vaccine may look like just "a small policy change by a naïve civilian leader appealing to his boss’s base," writes @markhertling.bsky.social. But it's more troubling than that: www.thebulwark.com/i/195027925/...
Screenshot of the opening of a Bulwark newsletter article by Gen. (ret.) Mark Hertling, from 22 April 2026. It is titled "Undue Command Influenza" (https://www.thebulwark.com/i/195027925/undue-command-influenza) and the excerpt reads as follows:

Secretary of Defense Pete Hegseth recently announced that he is discarding mandatory flu vaccinations for U.S. service members. It may appeal to an anti-vax political base, and it may sound minor in the abstract—part of what Secretary Hegseth described as “restoring freedom to the joint force.” But “freedom” also comes with civic and community obligation, especially in a profession built on individual and group responsibility. In military units and on military bases, individual choices have immediate and cascading consequences for the health and readiness of others.

Consider how other high-performance organizations or facilities with throngs of people in close contact handle contagious illnesses. If a professional sports team has a player with the flu, that athlete often isn’t welcomed into the locker room or told to push through practice. He’s isolated to prevent the spread of the virus.
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 20/04/2026
CW: #MicroFiction #Horror The defeated villain laughed at the face of the hero. "You fool, I'm immortal! No injury can kill me!" "Oh, really?" 371 years later, archeologists unearth a steel box. (1/2)
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Henry Segerman @henryseg.bsky.social · 18/04/2026
New video, on mechanisms that illustrate the duality between the cube and the octahedron! Here's one of them: a linkage with fabric panels designed by Sabetta Matsumoto. Full video at youtu.be/T9BNMLFHXUw
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nsato7.bsky.social @nsato7.bsky.social · 15/04/2026
I took a topology exam once. It was both open-book and closed-book.
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Oxford Mathematics @oxfordmathematics.bsky.social · 15/04/2026
Mathematicians love games. Games love mathematics. Maybe mathematics is just one big game?
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Data Rocks @t.datarocks.co.nz · 14/04/2026
This is what the internet is truly for. #owls #birds Also, #SciArt references galore.
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Joana de Castro Arnaud @jcastroarnaud.bsky.social · 13/04/2026
@ibgeoficial.bsky.social Excelente trabalho de vocês, ao mapear tantos detalhes da população brasileira. Há alguma previsão de fazer um retrato da população #trans no #Brasil? Quantos somos, qual nossa situação de vida e renda? Esperar até o próximo Censo pode ser demora demais.
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Adam Sharp @adamcsharp.bsky.social · 13/04/2026
Happy Praying Mantis Appreciation Day, to all who celebrate… CHILD PRAYING MANTIS: Dad, who are we all praying to exactly? DAD PRAYING MANTIS: Depends which religion you belong to CHILD: So not all people follow the same religion? DAD: No, son… we’re in sects
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