How geoengineering could save us from climate disaster; Have we broken mathematics?; Why exercise reduces cancer risk
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/
Learn more about your ad choices. Visit megaphone.fm/adchoices
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33:02
First full genome of Ancient Egyptian sequenced; Wild killer whales offer gifts to humans; First demonstration of interstellar navigation
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
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29:31
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29:31
This breakthrough could let gay couples have biological kids
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
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30:17
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30:17
First skull of mysterious human ancestor; Decoding whale language; Heatwaves 20x more likely to happen
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
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36:18
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36:18
Is this the first step to cyborg brains? How drones are reshaping warfare forever; New Vera Rubin observatory goes live
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/
Learn more about your ad choices. Visit megaphone.fm/adchoices
From the evolution of intelligent life, to the mysteries of consciousness; from the threat of the climate crisis to the search for dark matter, The world, the universe and us is your essential weekly dose of science and wonder in an uncertain world. Hosted by journalists Dr Rowan Hooper and Dr Penny Sarchet and joined each week by expert scientists in the field, the show draws on New Scientist’s unparalleled depth of reporting to put the stories that matter into context. Feed your curiosity with the podcast that will restore your sense of optimism and nourish your brain.
For more visit newscientist.com/podcasts
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