Sean Kelleher

Curious. Pedagogy nerd. Interested in science/transport history/inequality. Oide Chemistry PLL. Retweets ≠ endorsements. @kelleherscience.bsky.social

[Dr Dan Jones @Hookean1]

The latest issue of Classroom Physics from the IOP is now available online. The theme is Music and Physics:
https://t.co/q8ppwLmX8i

[Máire Duffy @mairemahon]

The @ScienceonStage festival comes to a close. Lots of friends made, lots of inspiring conversations with enthusiastic teachers from all over Europe and beyond.

[ScienceonStage Ireland @SonS_Ireland]

The Irish Team full of enthusiasm sharing their projects to over 500 teachers from over 35 countries all across Europe and even as far as Canada to Kazakhstan.
#sons2026 @ScienceonStage @DCU

[Sean Kelleher @kelleherscience]

G'wan the gang in green!

[Máire Duffy @mairemahon]

Team Ireland and their brilliant projects @ScienceonStage Klapeida 🇱🇹 @SonS_Ireland

[Sean Kelleher @kelleherscience]

@mairemahon @ScienceonStage @SonS_Ireland Best of luck!

[Liam Maughan @LiamMaugha83616]

SEC New Leaving Cert Geography exam papers have been released. https://t.co/L8I9QuipYe

[Sean Kelleher @kelleherscience]

When surface tension > gravity

[Cosmos Archive @cosmosarcive]

In space, water doesn’t behave the way you expect.

In microgravity, there’s no gravity pulling it down—so surface tension takes over. Instead of dripping or flowing, water sticks together and clings to surfaces, even forming a floating layer around your hands.

This is why astronauts can’t use normal sinks or showers. Water doesn’t fall away—it has to be carefully controlled and collected.

This iconic experiment by Chris Hadfield shows just how strange everyday physics becomes in space.

Credit: NASA / ESA

[Sean Kelleher @kelleherscience]

🧪 Eliminating another variable... https://t.co/bjWvpniDcY

[NASA @NASA]

Looking for more? Bookmark this link to our Artemis II multimedia library for quick access to the latest imagery. https://t.co/rzM1P0QbOl

[arfan /ˈɒr.fʌn/ @arfansthename]

@luusssso the raw scans of all the Hasselblad pictures (including Mercury and Gemini) are over at https://t.co/bPTeODsJ3w

offers them in small, medium, and full-size PNGs as well as the raw TIFF file

however they're sorted by mission and magazine so it's not as simple as keywords

[lusso @luusssso]

Just stumbled upon something absolutely incredible

An extensive archive of hi-res photographs of NASA’s Apollo Space Missions from 1968-1972

[Conor Murphy @conorsmurf]

My article in today's @IrishTimes

[Jamie Clark @XpatEducator]

🎁 FREE GIFT: FULL ROSENSHINE CPD PACK!

To celebrate 50 consecutive weeks of ⚗️DistillED, I’ve put together something quite cool…

Over the past year, Rosenshine’s Principles of Instruction has been one of the most requested topics from teachers and school leaders. So I’ve put together a complete, ready-to-run CPD pack to help schools explore and implement all 10 principles.

The download includes:

→ 10 CPD PowerPoints (ready for 30–45 min sessions)
→ 10 strategy checklists (practical classroom actions)
→ 10 planning templates (put principles into action )
→ Covers all 10 of Rosenshine’s Principles of Instruction

Everything you need to run ten focused CPD sessions — one for each principle.

👉 REPOST and comment ROSENSHINE and I’ll DM you the link. Cheers!

⏰ Available until Sunday 22 March!

[Cormac Coyne @CormacCoyne]

Aurora Borealis is really vibrant over Inis Oírr and Galway Bay this evening. Nourishment for the soul. Take a few minutes now to look towards the night sky.

[YN @yvonne_nolan]

#edchatie

[Conor Murphy @conorsmurf]

Something for your morning read, my article about the feeling of isolation in teaching.

[Sean Kelleher @kelleherscience]

@conorsmurf Excellent. Gives a very clear sense of that siloed isolation. So well put.

[Sean Kelleher @kelleherscience]

One of the steepest learning curves at the start of my teaching wasn't setting boundaries but being consistent & learning the multiple ways to communicate this w/o eating into teaching & learning.

[Tom Sherrington @teacherhead]

I think a subtle but very real element of a teacher’s behaviour management craft is the capacity to maintain boundaries by noticing issues and communicating botheredness: a firm/kind/adult tone of voice; body language, facial expressions that say, with conviction, ‘no’, ‘that’s unacceptable’. It’s calm, deliberate, assertive. Can be warm or a bit stern or even cross if needed. But you need it, whatever the backup system is. Students should know that you’re going to be bothered about boundaries. Your personal disapproval should matter to them / it nearly always does! When kids say ‘you don’t mess with Ms Smith’ it’s because she’ll notice, she’s bothered and makes that absolutely clear - in the nicest possible way.

I think this needs more explicit discussion and modelling in PD so it’s not seen as an ephemeral magic beans thing. I have met many ECTs who have this sorted already - but others need a ton of support. Sometimes it’s the noticing; sometimes it’s communicating the botheredness. It should be normal to discuss these things.

[Sean Kelleher @kelleherscience]

😂😂😂

[Brendan May @bmay]

This is glorious.

[Sean Kelleher @kelleherscience]

🧪 The knowledge of how to use flint to make a fire: it's affects on evolution? https://t.co/8TfxDB2aIq