Sean Geoghegan
@sea-geo.bsky.social
Retired Qualified #MedPhys Specialist in #TargetingCancer; South African born Australian of Irish descent who worked in Germany; humanist thinker; he/him; interested in games, radiation, physics, biology, #SoMe and positive cultural change. Slava Ukraini!
Pinned
Sean Geoghegan
@sea-geo.bsky.social
· Jan 20
Who am I? A question we might all ask ourselves. For me:
I'm a retired medical physicist specialised in radiation oncology. I was born in South Africa of Irish/Scot/German descent, and am now an Australian citizen. I once worked in Germany as a guest scientist shortly after the wall came down.
I'm a retired medical physicist specialised in radiation oncology. I was born in South Africa of Irish/Scot/German descent, and am now an Australian citizen. I once worked in Germany as a guest scientist shortly after the wall came down.
And …
November 11, 2025 at 11:09 PM
And …
Reposted by Sean Geoghegan
if you want to know what happened to Teen Vogue yesterday, my work wife @allegrak.bsky.social — who ran our politics section for 6 years until this past June — said it all in this.
can't even pull out a favorite part til I sign my separation letter lol, just read the whole thing.
can't even pull out a favorite part til I sign my separation letter lol, just read the whole thing.
What We Lost When Condé Nast Unceremoniously Shuttered Teen Vogue
This article is part of TPM Cafe, TPM’s home for opinion and news...
talkingpointsmemo.com
November 4, 2025 at 5:14 PM
if you want to know what happened to Teen Vogue yesterday, my work wife @allegrak.bsky.social — who ran our politics section for 6 years until this past June — said it all in this.
can't even pull out a favorite part til I sign my separation letter lol, just read the whole thing.
can't even pull out a favorite part til I sign my separation letter lol, just read the whole thing.
Reposted by Sean Geoghegan
This is a lovely article, showing that the spirit of enquiry and the thirst for new knowledge persist in a world where stupidity is so popular.
www.quantamagazine.org/first-shape-...
www.quantamagazine.org/first-shape-...
First Shape Found That Can’t Pass Through Itself | Quanta Magazine
After more than three centuries, a geometry problem that originated with a royal bet has been solved.
www.quantamagazine.org
October 25, 2025 at 6:42 AM
This is a lovely article, showing that the spirit of enquiry and the thirst for new knowledge persist in a world where stupidity is so popular.
www.quantamagazine.org/first-shape-...
www.quantamagazine.org/first-shape-...
Reposted by Sean Geoghegan
“Drew covered 1 of his posters with another, identical one..He added another prank – he rigged up a bucket of water. An anti-immigration protester..tore down the top one, leaving the original behind & spilling water everywhere. “Pick it up,” a police officer said”
www.theguardian.com/australia-ne...
www.theguardian.com/australia-ne...
At anti-immigration marches, Peter Drew spreads his renowned ‘Aussie’ posters – and waits
The Adelaide artist, who has faced vitriol for his work exploring national identity, covers city walls with his striking designs (and pranks) before protests
www.theguardian.com
October 19, 2025 at 10:53 PM
“Drew covered 1 of his posters with another, identical one..He added another prank – he rigged up a bucket of water. An anti-immigration protester..tore down the top one, leaving the original behind & spilling water everywhere. “Pick it up,” a police officer said”
www.theguardian.com/australia-ne...
www.theguardian.com/australia-ne...
Reposted by Sean Geoghegan
For newer users of BlueSky, please alt-text your images. It helps people who use screen-readers or who have slow internet connections understand the image you've uploaded. Make the web accessible.
I rarely reshare images without alt-text & I know others do the same. Alt-text your images for reach
I rarely reshare images without alt-text & I know others do the same. Alt-text your images for reach
October 10, 2025 at 1:17 AM
For newer users of BlueSky, please alt-text your images. It helps people who use screen-readers or who have slow internet connections understand the image you've uploaded. Make the web accessible.
I rarely reshare images without alt-text & I know others do the same. Alt-text your images for reach
I rarely reshare images without alt-text & I know others do the same. Alt-text your images for reach
Lovely walking around the trails near Olinda and the Dandenong Ranges Botanic Garden on a cool Spring morning. It’s a pleasure to be out and about with good company. I hope your days are as enjoyable as they can be.
October 9, 2025 at 11:57 PM
Lovely walking around the trails near Olinda and the Dandenong Ranges Botanic Garden on a cool Spring morning. It’s a pleasure to be out and about with good company. I hope your days are as enjoyable as they can be.
Ancient forest vibes on our walk along the Merri Creek Trail today, with hints of traces of the fey in the form of red coral patches during a very light mist.
October 3, 2025 at 4:17 AM
Ancient forest vibes on our walk along the Merri Creek Trail today, with hints of traces of the fey in the form of red coral patches during a very light mist.
Reposted by Sean Geoghegan
“It actually doesn’t take much to be considered a difficult woman. That’s why there are so many of us.”
― Jane Goodall
💙 RIP to a real one. My childhood hero
― Jane Goodall
💙 RIP to a real one. My childhood hero
October 2, 2025 at 2:56 AM
“It actually doesn’t take much to be considered a difficult woman. That’s why there are so many of us.”
― Jane Goodall
💙 RIP to a real one. My childhood hero
― Jane Goodall
💙 RIP to a real one. My childhood hero
Reposted by Sean Geoghegan
There are a few people that are inspirations to almost all scientists that I know, and Jane Goodall was one of them. RIP. 😢
Jane Goodall, the celebrated primatologist and conservationist, has died
Jane Goodall, the conservationist renowned for her groundbreaking chimpanzee field research and globe-spanning environmental advocacy, has died. She was 91.
apnews.com
October 1, 2025 at 8:53 PM
There are a few people that are inspirations to almost all scientists that I know, and Jane Goodall was one of them. RIP. 😢
Reposted by Sean Geoghegan
Farewell to Jane Goodall 🌿 A pioneering scientist whose groundbreaking work with primates transformed how we understand ourselves. She showed how research and advocacy can unite, inspiring generations.
Jane Goodall, Eminent Primatologist Who Chronicled the Lives of Chimps, Dies at 91
Her discoveries in the 1960s about how chimpanzees behaved in the wild broke new ground and represented what was called “one of the Western world’s great scientific achievements.”
www.nytimes.com
October 1, 2025 at 9:36 PM
Farewell to Jane Goodall 🌿 A pioneering scientist whose groundbreaking work with primates transformed how we understand ourselves. She showed how research and advocacy can unite, inspiring generations.
Reposted by Sean Geoghegan
The South Korean Ministry of Defense has awarded medals of merit to 11 officers for disobeying direct orders of superiors during the martial law fiasco, orders that they deemed to be contrary to the constitution and endangerment to democracy.
www.chosun.com/english/nati...
www.chosun.com/english/nati...
National Defense Ministry Honors 11 Soldiers for Refusing Illegal Orders
National Defense Ministry Honors 11 Soldiers for Refusing Illegal Orders Honored for rejecting illegal orders during martial law, Marine death probe
www.chosun.com
September 27, 2025 at 6:44 PM
The South Korean Ministry of Defense has awarded medals of merit to 11 officers for disobeying direct orders of superiors during the martial law fiasco, orders that they deemed to be contrary to the constitution and endangerment to democracy.
www.chosun.com/english/nati...
www.chosun.com/english/nati...
Reposted by Sean Geoghegan
It feels like an insult to the notion of objective reality to invoke “experts” to weigh in on a numerical fact you can verify with a pocket calculator
September 26, 2025 at 3:42 AM
It feels like an insult to the notion of objective reality to invoke “experts” to weigh in on a numerical fact you can verify with a pocket calculator
Reposted by Sean Geoghegan
Truly impressive number of birds migrating tonight. More than 800 MILLION birds up in the air right now❗ #BirdMigration
September 25, 2025 at 2:59 AM
Truly impressive number of birds migrating tonight. More than 800 MILLION birds up in the air right now❗ #BirdMigration
This made me smile with joy. I recognise so much in this piece to camera and appreciate his attention to detail.
September 25, 2025 at 12:45 AM
This made me smile with joy. I recognise so much in this piece to camera and appreciate his attention to detail.
Reposted by Sean Geoghegan
‘Nickname’ is not ‘nick’ + ‘name.’
It was originally ‘ekename.’
‘Eke’ was the Middle English word for “also” or “in addition.”
Since ‘ekename’ began with a vowel, people used ‘an’ before it.
Over time, 'an ekename' became 'a nickname.'
It was originally ‘ekename.’
‘Eke’ was the Middle English word for “also” or “in addition.”
Since ‘ekename’ began with a vowel, people used ‘an’ before it.
Over time, 'an ekename' became 'a nickname.'
September 24, 2025 at 5:16 PM
‘Nickname’ is not ‘nick’ + ‘name.’
It was originally ‘ekename.’
‘Eke’ was the Middle English word for “also” or “in addition.”
Since ‘ekename’ began with a vowel, people used ‘an’ before it.
Over time, 'an ekename' became 'a nickname.'
It was originally ‘ekename.’
‘Eke’ was the Middle English word for “also” or “in addition.”
Since ‘ekename’ began with a vowel, people used ‘an’ before it.
Over time, 'an ekename' became 'a nickname.'
Reposted by Sean Geoghegan
An epic double eruption from opposite ends of the Sun this week! Truly beautiful.
September 24, 2025 at 8:34 PM
An epic double eruption from opposite ends of the Sun this week! Truly beautiful.
I spy, with my little eye, three holes in the ground. And you may say …
September 24, 2025 at 11:22 PM
I spy, with my little eye, three holes in the ground. And you may say …
Rather enjoying Wilson’s Promontory as Spring starts here in Australia. It’s a good break from the trials and tribulations of the world, a deserved reenergising relief. The weather has been varied and the walking inspirational. A wonderful part of the natural world.
September 14, 2025 at 2:11 AM
Rather enjoying Wilson’s Promontory as Spring starts here in Australia. It’s a good break from the trials and tribulations of the world, a deserved reenergising relief. The weather has been varied and the walking inspirational. A wonderful part of the natural world.
OK, that’s it, the most destructive what-if to date. Nothing to see here, nothing and everything at all. This video hooked me at 7 seconds.
What if the Moon were made entirely of electrons?
Watch the latest What If? video collaboration with @minuteearth.bsky.social!
youtu.be/DiWFXv9N0Vs
Watch the latest What If? video collaboration with @minuteearth.bsky.social!
youtu.be/DiWFXv9N0Vs
What if the Moon were made entirely of electrons?
YouTube video by xkcd's What If?
youtu.be
September 9, 2025 at 10:59 PM
OK, that’s it, the most destructive what-if to date. Nothing to see here, nothing and everything at all. This video hooked me at 7 seconds.
Reposted by Sean Geoghegan
Banned chemical found by scientist in fresh berries sold at NSW supermarkets
www.abc.net.au/news/2025-09...
www.abc.net.au/news/2025-09...
Scientist discovers banned chemical in berries sold at NSW supermarkets
A scientist investigating why pesticides were appearing in marine life discovers a banned chemical on NSW berries. The underwhelming response from the government has exposed regulatory blind spots in ...
www.abc.net.au
September 8, 2025 at 2:21 AM
Banned chemical found by scientist in fresh berries sold at NSW supermarkets
www.abc.net.au/news/2025-09...
www.abc.net.au/news/2025-09...
Reposted by Sean Geoghegan
David Pope in Canberra Times
September 5, 2025 at 9:53 AM
David Pope in Canberra Times
It’s great seeing success emerge from chaos and confusion. BlueSky seems to be taking a valued place as a trusted social media platform. It is designed to be independent and user controlled, so much so that science media has moved here from Twitter.
she slayed www.cnbc.com/2025/08/29/b...
Bluesky CEO: I turned a Twitter research project into a rival company—'we've achieved what a lot of people said was impossible'
Under CEO Jay Graber, social media company Bluesky has grown to 38 million registered users while weathering large-scale challenges over the past few years.
www.cnbc.com
August 29, 2025 at 10:26 PM
It’s great seeing success emerge from chaos and confusion. BlueSky seems to be taking a valued place as a trusted social media platform. It is designed to be independent and user controlled, so much so that science media has moved here from Twitter.
Reposted by Sean Geoghegan
It's so cool to see actually planetary system formation at work. When planets form, they sweep up the dust and debris around their orbit, forming gaps like the one seen here. Plus, you can see the planet!!
#planetsci
www.eso.org/public/image...
#planetsci
www.eso.org/public/image...
A very hungry planet
A very hungry planet
www.eso.org
August 26, 2025 at 9:32 PM
It's so cool to see actually planetary system formation at work. When planets form, they sweep up the dust and debris around their orbit, forming gaps like the one seen here. Plus, you can see the planet!!
#planetsci
www.eso.org/public/image...
#planetsci
www.eso.org/public/image...
The annual human sacrifice on #InternationalDogDay. Someone has to be chosen. This is from a few years ago so who’s going to volunteer?
[P] In honor of #NationalDogDay, and in the interest of posting something that’s not completely doom-filled, here a video of me getting buried under fourteen golden retriever puppies back in 2021.
Genuinely one of the best memories of my life.
Genuinely one of the best memories of my life.
August 27, 2025 at 1:21 AM
The annual human sacrifice on #InternationalDogDay. Someone has to be chosen. This is from a few years ago so who’s going to volunteer?