Another episode title Im jealous of becuase I didn't pick it, it's the work of Keith Houston a writer and software engineer who has made a habit of writing about things that are there in plain sight. He has written about the history of punctuation, a book about the book and last year a book about the history of the pocket calculator. There's lots of interesting nuggets in this episode including how an ant counts, who counts with their genitals, the unlikely role a Tea company played in making calculators, what happens when there's an actual bug in your computer, and when it comes to calculators, what does Keith think is the fairest of them all.

My first replay! Given what we've been hearing about Google and their Gemini code disaster and bias and all sorts, time to revisit one of my favourite episodes, with Cathy O'Neil author of Weapons of Math destruction and has a company that audits algorithms. At some stage in a futurstic world when you're in trouble with the Algo Cops you'll wish you listened to Cathy. Eagle-eyed or maybe that should be bat-eared listeners may note that I used to do a lot more preamble with the podcast and lean more heavily on my daughters for 'content' but as I've tried to put a podcast out every weekish, I can't be getting the children on board all the time. They've their own stuff to do. And are understandably less inclined to help out on Daddy's speculative projects.

This week my guest is Hannah Daly, Professor of Sustainable Energy at University College Cork. It's the third of a trilogy about energy - a sort of trilogy there was another episode in between (a sort of Rogue One of maths/energy episodes) While the other two talk about where we get energy -magical molecules- or store them -stone batteries- this one focuses on working out how much we'll need using mathematical models.

My guest is John Fardy, presenter of Newstalk's Radio (and GoLoud's) movie show ScreenTime. He has watched a lot of movies which means, statistically he's seen a lot of mathematics in movies. Therefore a lot of tall blackboards, a lot of troubled geniuses who struggle to talk to people but speak to numbers with ease, a lot of running around with pieces of paper that have the Eureka moment on them. We chat about his favourite mathematical movies and also what movies would we like to see made.

A look at some of the stories behind the massive sums of an energy revolution. My guest is David Volts, energy journalist and writer of the Volts newsletter and host of the volts podcast. After Catherine Sheridan's H2 Oh! last week, this is the second of what looks to be an inadvertent energy trilogy. (Or enilogy or trinergy. No doubt that's been trademarked already) David Roberts has been writing and talking for years about the challenges but also the incredibly cool stuff happening in the biggest equation the world has ever seen: The terrajoules of energy that the planet uses every year: how to make it from electrons moving around instead of just burning stuff in the ground. we talk about carbon fibre electric wires, magic cement, stone batteries, black mass and why changing the energy system of an entire planet sounds like a crazy idea but it just might work

Catherine Sheridan, an engineer and systems thinker who after 20 years working on water, roads, energy is focussed on a tiny powerful magic little molecule: Hydrogen. We talk 5th year Physics experiments, making the world a fairer place, why the poetry of Robert Graves and the short stories of David Foster Wallace can teach us about the maths of molecules, why we need silver shrapnel rather than silver bullets, a little plug for mygug a magic egg made in cork that turns your food waste into heat and why we need to start hiring carbon accountants. You can find her on all the socials and catherinesheridan.ie. If H2 is your thing and let's face it, it is whether you like it or not, she's the woman to go to. She mentions one book I'm definitely going to read: How the world really works by Vaclav Smil.

Function Room 39 There's Been a Breakthrough with TJ Hegarty. TJ Hegarty is the founder of Breakthrough Maths an online maths tutoring company based in Ireland. We talk about small farmers, not letting your father down, wanting to sell butter giving up in the Far East, changing your mind and deciding to give up your job and not sell butter in the Far East, semantic memory, off the grid tutors and where he wants his next breakthrough to be. Warning: This episode contains strong elements of Corkness

13th December, on the day of the earliest sunset in Dublin, my guest is Eibhear OHanlon, who more than anyone else knows how to call it a day. He has been the curator of theauldsthretch twitter account, now on mastodon and bluesky for 8 years. Each day he lets gives people a bit of hope and a warning about the length of their day. We talk about earth tilts, the weirdness of leap years, how do you know the sun has set, the importance of a smidge.

This week we look at the maths of conspiracy theories with physicist, cancer researcher, science writer author of the Award-winning The Irrational Ape why flawed logic puts us all at risk. how to tell if one most likely isn't true, a scary thing called Availability Heuristic, why it's not sugar is making those children hyper at the party, what you think when you first hear the name "Freddy Starr"

Kjartan (pronounced Jartan) Poskitt is a maths book phenomenon. Author of Murderous Maths a series of, funny books for children about maths, they've been published in 25 countries. We talk about duels, how a fencing teacher went looking for pi, Archimedes, the magic stall at York market and the importance of having your own lair.

The mysterious world of the Riemann Hypothesis. This is about an unsolved problem relating to prime numbers. Bernhard Riemann was a German mathematician who lived in the 19th century and along with a lot of work on geometry also looked at prime numbers. If you're finding this hard to grasp don't worry. Me too. And this episode is not just about this, it's about the nature of things that are unsolved and why the search for solutions itself is important. My guest is Dr Alex Kontorovich professor of Mathematics at Rutgers university in New Jersey, He takes me on a tour of 18th and 19th century geniuses who couldn't stop thinking about prime numbers. There will be bits where you'd really want to visualise what's going on. For that, check out the link below You'll hear me butt in -in the edit- with some simple explanations of things I didn't understand at the time. I didn't interrupt at the time because I didn't know what queesiotn to ask and wanted to appear smarter than i was. You know, a tale as old as time. How I Learned to Love and Fear the Riemann Hypothesis | Quanta Magazine

My guest is Joanna Donnelly meteorologist and author of From Malin Head to Mizen Head, a lovely book about the almost meditative experience that is Irish Sea Area Forecast. Hers is the voice Irish radio listeners will hear last thing at night and first thing in the morning. We talk Hecto Pascals, my favourite of all the Pascals, how maths finds some patterns on this giant sphere of ours and why its best to give bad news first.

Climate Worrier - the maths of Climate Change. I talk to mathematiciand a man wading kneed deep in the climate models, Chris Budd. Professor of Applied Mathematics at the University of Bath, He takes me painstakingly -but not painfully- through the key Big Numbers that you should know about when it comes to climate change. We recorded this a couple of years ago during Maths Week 2023 and guess what, it's still an issue! WHo knew? (Apologies for sound quality on this, I have a slight Long Wave Radio sound about me, just it was a youtube interview and I think the internet had covid when we recorded.)

This week it's the maths of puzzles, and how to get wrap your brain around the fact that the answer isn't obvious. Rob Eastaway is my guest- the first returning guest. He has a book out called Headscratchers - a compendium of puzzles from the last five years of the New Scientist. And he's over in Ireland for Mathsweek. (check out mathsweek.ie). And given the weekend that was in it, we really have to do a snippet on the maths of rugby.

this week in the function room, It's in our Nature - the fascinating world of biomimicry My guest is Kathyrn Parkes, a technologist with a career spanning nearly 3 decades in designing products and an expert in User Experience. She tells me about what we can learn from nature, the stigmergy of termites, why ants don't have a boss, the benefits of hippo sweat, but also some unusual stuff too.

this week in the function room, It's Anyone's Guess - the maths of guesswork David Malone of Maynooth University and the Hamilton Institute. I ride the wave of ignorance through some big topics like Information theory, Entropy, what makes a good password and how hard it would be to figure out what I had for breakfast. But first, I notice David has that all important mathematician background behind him in the interview - a white board with lots of squiggly symbols. i have to ask

The maths of symmetry. Hi it’s me Colm O’Regan. The function room is back after a little summer break and my guest is Pauline Mellon, professor of mathematics at UCD She wants to talk about symmetry and I’m glad she did. She brings me on a tour of maths, religion, biology, art, chemistry, AI and naturally of course town planning.

The baffling arithmetic of Dereliction. I talk to Jude Sherry and Frank O’Connor of Derelict Ireland who ask the very simple question about an equation that makes no sense: Why is it that there are tens of thousands of people who need a home and tens of thousand of empty buildings that could be homes. Although specifically about Ireland, this is a question that could be asked anywhere.

Function Room 27 A Sense Of Ounce – The absolutely fascinating history of one of the most important hallmarks of our existence - how and why we measure things. James Vincent has written a book, Beyond Measure about it and he joins me to talk about this thing we completely take for granted that has changed the world, been part of revolutions, where the metre is stored and also the very strange world of anti-metric guerillas.

My guest is author of Chums, Simon Kuper about how a small cabal of Oxford chums managed to take over British politics. And from his book just how crap an Oxford and Eton education could be and you can still make it to the top. Along the way we learn what happens when a generation of leaders neither has a clue nor gives a toss about science and maths, the curious case of Jacob Rees Mogg, why Boris Johnson has been an accidental anarchist. what the French for chums is.