The World, the Universe and Us

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AI wins first gold at maths Olympic games; How mitochondria are linked to sleep; Famous psychology trick works on octopuses too Jul 25, 2025

Show notes

Episode 313

AI has won gold at the world’s hardest maths event. For the first time, AI programs that use entirely natural language like ChatGPT, have used general reasoning to solve incredibly difficult tests at the International Maths Olympiad in Australia. Humans are still in the lead…for now. But could this be a big leap forward in the quest for artificial general intelligence?

Mitochondria - famously the powerhouses of our cells - are linked to sleep in ways we never realised. In a study on fruit flies, researchers discovered that the longer they stay awake, the more damage is caused to their mitochondria. This pressure increasingly pushes the flies to go to sleep - to begin the repair cycle. They also showed ways of engineering and altering fruit fly mitochondria that could impact their sleep duration. Given how mitochondria is essential in all complex life forms - like us - could it one day lead to sleep treatments?

An iconic psychology experiment has been used to trick octopuses. The rubber hand illusion has been used on people - and some other mammals - to fool them into thinking a fake hand is their own. And now it turns out octopuses are fooled just as easily. Researchers used a fake tentacle to recreate the trick - giving us a deeper insight into how octopus brains work.

Chapters:

(00:33) AI wins gold at maths Olympics

(12:24) How mitochondria are linked to sleep

(22:13) Octopus rubber hand illusion

Hosted by Rowan Hooper and Penny Sarchet, with guests Alex Wilkins and Alexandra Thompson.

To read more about these stories, visit https://www.newscientist.com/

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Scientists test engineered microbes to fight disease; Has 1.5 degrees failed?; New theory why we’ve not found aliens Jul 18, 2025

Show notes

Episode 312

People have been given genetically engineered microbes to prevent a common health condition - and it worked. The gut microbiome is now known to be associated with many health conditions - and in this case, the team managed to treat 9 people who get recurring kidney stones. With the gut’s links to mental health, cancer and more, could engineered microbes be used to treat more conditions in the future?

Is 1.5C dead? It’s looking increasingly likely that we’re going to breach 1.5C of global warming - the goal set out in the Paris agreement. So do we need to set a new goal now? As scientists come up with alternative numbers to aim for, many are worried that moving the goalposts will kill climate ambition. But is there a middle ground that keeps everyone happy?

Where are all the aliens? We may now have a solution to the famous Fermi paradox, which questions why we’ve never met anyone else in the universe, despite the existence of many Earth-like planets. And it’s all to do with tectonic plates - a geological phenomenon that may be rare outside of Earth, helping complex life to emerge on our planet.

Chapters:

(00:39) Genetically modified gut microbes

(07:03) Setting a new goal for global warming

(17:20) Solving the Fermi paradox

Hosted by Rowan Hooper and Penny Sarchet, with guests Grace Wade, Madeleine Cuff, Alex Wilkins, Ilana Seid, Robert Stern and Taras Gerya.

To read more about these stories, visit https://www.newscientist.com/

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How geoengineering could save us from climate disaster; Have we broken mathematics?; Why exercise reduces cancer risk Jul 11, 2025

Show notes

Episode 311

Geoengineering could be the best way to avoid catastrophic climate disaster - but there’s a big catch. In the recent Global Tipping Points Conference in the UK, scientists discussed growing concerns that the AMOC may be on the verge of collapsing. This is a system of ocean currents that plays a crucial role in regulating global climate. With the window of action rapidly closing, one climate model suggests geoengineering is the fastest way to stop this from happening. But without global consensus, the team explains how geoengineering could also damage the climate further or even lead to a new kind of warfare.

We’re brushing up against the edge of mathematics with the uncovering of a number so large it’s hard to even describe. Busy Beaver numbers are used to describe the longest possible run-times of ‘Turing machines’ - a theoretical model of computation conceived by Alan Turing. These numbers are surprisingly hard to figure out. But after uncovering the fifth Busy Beaver number in 2021, an online community of mathematicians now thinks they’ve figured out the sixth number - and it’s beyond massive. What does this mean for the nature of mathematics?

We’ve known for a long time that exercise is a great way of reducing cancer risk - and now we finally know why. A new study suggests changes in the microbiome caused by exercise can reduce tumour growth - and there appears to be one particular molecule that’s doing this good work. Does this mean we could one day use poop transplants as a cancer treatment?

Chapters:

(00:22) Can geoengineering save us from climate disaster?

(16:59) Have we broken mathematics?

(25:42) Why exercise reduces cancer risk

Hosted by Rowan Hooper and Penny Sarchet, with guests Michael Le Page, Jacob Aron, Claudia Wieners and Marlies Meisel.

To read more about these stories, visit https://www.newscientist.com/

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First full genome of Ancient Egyptian sequenced; Wild killer whales offer gifts to humans; First demonstration of interstellar navigation Jul 04, 2025

Show notes

Episode 310

An ancient Egyptian's complete genome has been read for the first time. The DNA of a man who lived in Egypt over 4500 years ago offers a new window into the ancient society and hints at surprising genetic connections with Mesopotamia. Based on forensic analysis of the man's skeleton and preserved images of different Egyptian occupations, the researchers think his most likely occupation was a potter. The team discusses what the breakthrough means for our understanding of early Egypt and even for the origin of writing.

Wild orcas, or killer whales, have been seen giving gifts to humans - things like pieces of liver, rays and dead birds. This is the first time these apparent acts of altruism have been documented. Does this prove whales are capable of showing compassion or kindness?

Images beamed back from the New Horizons spacecraft, which has left the solar system, have enabled the first test of interstellar navigation. By measuring the distance between two stars that it snapped images of, astronomers have been able to pinpoint its location in the galaxy. And in other interstellar news, we also just spotted an object hurtling towards our solar system. Recently named ‘Atlas’, this object will be whizzing by in October, close enough for us to study.

Chapters:

(00:42) Ancient Egyptian genome sequenced

(12:33) Killer whales give humans gifts

(18:59) First demonstration of interstellar navigation

Hosted by Rowan Hooper and Penny Sarchet, with guests Mike Marshall, Alex Wilkins, Joel Irish and Lori Marino.

To read more about these stories, visit https://www.newscientist.com/

Learn more about your ad choices. Visit megaphone.fm/adchoices

Mice with two dads; perfect your sleep with science; how lizards survived dinosaur-killing asteroid Jun 27, 2025

Show notes

Ep 309

A groundbreaking experiment in reproductive biology has resulted in mice being born from two biological fathers. By fusing sperm and putting them into an emptied egg cell, researchers in China have produced healthy and fertile offspring from two male mice. While it’s early days and the technique requires hundreds of embryos to get results, it opens up the possibility of same-sex reproduction in mammals, including humans, in the future.

New insights into the power of sleep reveal how short naps can boost creativity. A study found that reaching a certain stage of sleep, known as N2, significantly increased people’s chances of having an “aha!” moment. It’s more evidence of how deeply intertwined sleep is with problem-solving and innovation, and why naps might be more productive than we thought.

One ancient lizard family managed to survive the asteroid that killed the dinosaurs, and they’re still around today! Scientists have traced the lineage of night lizards back to over 90 million years ago. Their ability to shelter underground and survive on little energy may have helped them live through one of Earth’s biggest disasters.

Chapters:

(00:38) Same-sex reproduction breakthrough

(12:09) Power naps and creativity

(22:37) Ancient lizard survives dinosaur-killing asteroid

Hosted by Rowan Hooper, Penny Sarchet, and Michael Le Page.

To read more about these stories, visit https://www.newscientist.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

First skull of mysterious human ancestor; Decoding whale language; Heatwaves 20x more likely to happen Jun 20, 2025

Show notes

Episode 308

An ancient skull discovered in China has been confirmed to belong to a Denisovan. It’s been tough to study this mysterious human ancestor, as we’ve only ever found a finger and jaw bone - so this new discovery could reshape our understanding of them. After being kept secret for decades, the “dragon man” skull is opening up a new window into our past.

We’ve unlocked another clue in our quest to decode whale language. Analysis of 15 sperm whales in the Caribbean suggest their language may contain vowels, used in a similar way to human language. Using their various clicks, researchers have discovered interesting patterns in the way they communicate.

Feeling hot and sweaty? Well, strap in - because these heatwaves are set to continue…and get worse. Summers are evolving fast as a result of climate change and weather events that would’ve once been rare are becoming much more common. Find out how the UK could be in for a string of long 40C summers in the very near future.

The winner of The Women’s Prize for Non-Fiction has been revealed - Dr Rachel Clarke claims the title for her book “The Story of a Heart”. The book explores the history of heart transplants and tells the story of a nine year old girl whose heart saved two other children and two adults. Rachel explains why she chose to write this story and the surprising things she learnt along the way.

Chapters:

(00:41) Denisovan skull discovery

(14:02) Deconding whale language

(18:14) Hot summers becoming more common

(26:16) Winner of The Women’s Prize for Non-Fiction

Hosted by Rowan Hooper and Penny Sarchet, with guests Madeleine Cuff, Mike Marshall, Gillian Kay, Alison Flood and Rachel Clarke.

To read more about these stories, visit https://www.newscientist.com/

Learn more about your ad choices. Visit megaphone.fm/adchoices

Is this the first step to cyborg brains? How drones are reshaping warfare forever; New Vera Rubin observatory goes live Jun 13, 2025

Show notes

Episode 307

Using new “ultrasoft” electronics, researchers at Harvard have effectively created tadpole cyborgs. A soft bioelectronic device has been implanted into their brains - one which grows with them as they develop into frogs. This neural implant is a first step in helping us better understand the inner workings of the brain. But could this work in mammals…or humans? Discussing just that, the Royal Society held a meeting this week called Cyborg Futures. How soon until humans become one with machines?

A small fleet of cheap drones has been deployed by Ukraine’s security service, causing $7 billion of damage to Russian air power. Just 117 drones were able to take out a third of Russia’s nuclear bomb force. Difficult to catch, hard to jam and nearly impossible to shoot down - are drones a paradigm shift in warfare?

The Vera Rubin Observatory in Chile has just opened, promising to carry out a legacy survey of space and time. US editor Chelsea Whyte visited the newly operational telescope to see how it will map out the night sky in never-before-seen detail. Learn how it hopes to answer some of the biggest mysteries about dark matter and dark energy - and find out about the legacy of Vera Rubin, the astronomer the telescope is named after.

Think net-zero climate action is costing us way too much, driving up living costs and damaging the economy? Think again. The Organisation for Economic Co-operation and Development (OECD) has taken on all of the misinformation circulating about our goal to achieve net zero emissions, showing that raising climate ambition would actually boost the global economy. Find out why.

Chapters:

(00:32) Frogs with cyborg brains…are humans next?

(11:25) How drones are reshaping warfare

(16:16) Vera Rubin observatory opens

(24:59) How net zero will boost the global economy

Hosted by Rowan Hooper and Penny Sarchet, with guests Alexandra Thompson, Chelsea Whyte, Jonathan Rossiter, Tamar Makin, Robert Bunker and Simon Evans.

To read more about these stories, visit https://www.newscientist.com/

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$1 trillion of platinum on the moon; how your brain distinguishes between reality and imagination; rise of the hyperworm Jun 06, 2025

Show notes

Episode 306

It’s been discovered that the moon is probably home to $1 trillion worth of platinum. Researchers suggest nearly 6500 of the Moon’s craters were made by asteroids containing commercial quantities of platinum, palladium, rhodium, ruthenium, iridium and osmium. Does that mean space companies are going to head out on mining missions imminently…and should they? Hear the reasons for and against mining on the Moon.

When you imagine something in your mind, how does your brain know that it’s not real? Certain brain regions have been identified in a new experiment which help keep reality and make-believe separate. This finding could tell us a lot about conditions like schizophrenia - or what’s going on when we dream. It may even answer that question; are we living in a simulation? Read our imagination special here: https://www.newscientist.com/issue/3545/

A newly discovered emergent behaviour has been found in nematode worms - the world’s commonest animal. These millimetre long worms are able to merge to form superorganisms, creating tentacles or towers that can straddle long distances. Learn about this collective behaviour and how it's coordinated.

Chapters:

(00:16) Platinum on the moon

(08:44) How your brain distinguishes between reality and imagination

(18:05) Rise of the hyperworm - nematodes merge to form superorganism

Hosted by Rowan Hooper and Penny Sarchet, with guests Carissa Wong, Jayanth Chennamangalam, Steve Fleming and Serena Ding.

To read more about these stories, visit https://www.newscientist.com/

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The real threat of AI - ethics, exploitation and the erosion of truth May 30, 2025

Show notes

Episode 305

As artificial intelligence grows into more and more aspects of our lives, it seems we’re just at the beginning of the boom. Hundreds of billions of dollars are being pumped into advancing AI capabilities, making it the best funded area in science. But, just like the dot-com revolution, is it a bubble waiting to burst?

In this special episode of the podcast, we explore the growing promise of AI - and also the existential threat it poses.

Despite the amount of money going into AI, chatbots are still making glaring mistakes, plagued with hallucinations. All the while students are relying on them to do their homework for them, and others are using them to replace very human tasks, like writing wedding speeches. So we hear from two authors who have been thinking hard about AI and machine learning - and what that means for the future.

We also get into the idea of AGI, artificial general intelligence - and its cousin, artificial superintelligence, which may already exist in certain areas. With many researchers concerned about AI overthrowing humanity, is it even worth worrying about? We dig into whether AGI is even possible and who would want to develop it.

This discussion has to include some mention of the human and environmental costs of these technologies, too. Energy demands are expected to skyrocket over the next few years - can the planet keep up with the demand? And alongside that, there’s a lot of human exploitation going on to help fuel these machines - a little-known fact that has to be tackled.

Finally, is superintelligent AI a threat to the existence of humankind - will they want to wipe us out when they get smart enough? Or is the threat more insidious, one where we watch the slow erosion of truth and democracy?

Chapters:

(02:49) How chatbots and LLMs came to dominate

(15:50) Superintelligent AI

(18:18) What does $500 billion buy?

(19:30) The high energy demand of AI

(20:56) The murky ethics of the AI race

(25:15) How AI is being thrust upon us

(26:48) The existential threat of AI

(29:57) Is AI a bubble waiting to burst?

Hosted by Rowan Hooper and Sophie Bushwick, with guests Alex Wilkins, Adam Becker and Emily Bender.
To read more about these stories, visit https://www.newscientist.com/

Learn more about your ad choices. Visit megaphone.fm/adchoices

Are smartphones really causing mental illness in teens?; More evidence of alien life; Digital oak trees May 23, 2025

Show notes

Episode 304

It seems the world is on heightened alert about the impact smartphones are having on our children’s brains. But are we right to be worried? Jonathan Haidt’s book the Anxious Generation has played a big role in this debate, with many researchers agreeing smartphones cause harm and action needs to be taken. But is there actually any scientific evidence to back all of these claims up?

The “strongest evidence” for alien life was announced just a few weeks ago - but not everyone was happy with this discovery and it came under quite a lot of fire. The team that discovered this alien signal were analysing data from the James Webb Space Telescope. Now other researchers have looked at the same data and have come to different conclusions. But rather than proving critics right, it seems the evidence for aliens just got stronger.

A digital oak tree is on display at Kew Gardens in London. Of the Oak is an immersive installation by art collective Marshmallow Laser Feast in collaboration with ecologists, biologists and researchers. The aim is to show the inner workings of the oak, to allow people to connect more deeply with it and to tune into “tree time”.

Chapters:

(00:32) Are smartphones causing mental illness in teens?

(05:58) More evidence for alien life

(13:28) Of the Oak display at Kew

Hosted by Timothy Revell and Madeleine Cuff, with guests Jacob Aron, Alex Wilkins, Rowan Hooper, Ersin Han Ersin and Ruth Mitchell.
To read more about these stories, visit https://www.newscientist.com/

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