You might not consider smell to be that important compared to some of your other senses. But, it’s intrinsic to our sense of taste, place, memory and desire. To uncover the surprising importance of our sense of smell, Emma Kennedy is joined by Professor Stuart J. Firestein, chair of the Department of Biological Sciences at Columbia University, and Professor Barry C. Smith, director of Philosophy at the University of London’s School of Advanced Study.    WHY? is presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production and theme music by Jade Bailey. Managing editor: Jacob Jarvis. Group editor: Andrew Harrison. Artwork by James Parrett. Additional music is from Artlist.io. WHY? is a Podmasters Production.    Instagram | X | Threads | Bluesky   Learn more about your ad choices. Visit podcastchoices.com/adchoices

Time travel was once the holy grail of science fiction, but scientists have now shown that time travel into the future is theoretically possible – so why not backwards? If we can use the quirks of physics to move into the future “faster” than we’d get there anyway, could it be possible to move into the past? And if time travel in either direction became possible, what would it do to our world… and ourselves?    Emma Kennedy asks Jim Al-Khalili, famed for The Life Scientific and professor of theoretical physics at the University of Surrey, and Nikk Effingham, professor of philosophy at the University of Birmingham, about our days of future past.    Buy Nikk’s book Does Tomorrow Exist?: A Debate through our affiliate bookshop and you’ll help fund Why? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too.    Check out Jim’s Radio 4 show The Life Scientific.    WHY? is presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production and theme music by Jade Bailey. Managing editor: Jacob Jarvis. Group editor: Andrew Harrison. Artwork by James Parrett. Additional music is from Artlist.io. WHY? is a Podmasters Production.     Instagram | X | Threads | Bluesky   Learn more about your ad choices. Visit podcastchoices.com/adchoices

Many of us are obsessed with true crime documentaries and podcasts, and actively seek out the most gruesome details of horrific murder, torture and kidnapping. It’s all pretty horrible – so why are we drawn to it? Does ‘evil’ really exist – and if so, what does it look like? Are people born evil or do they become it over time?    Emma Kennedy is joined by forensic psychiatrist Dr Sohom Das and the UK’s top expert on serial killers, criminologist Professor David Wilson to uncover why we are so obsessed with evil.      Buy Dr Das’ book In Two Minds: Shocking true stories of murder, justice and recovery from a forensic psychiatrist and Professor Wilson’s My Life with Murderers: Behind Bars with the World’s Most Violent Men through our affiliate bookshop and you’ll help fund Why? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too.    WHY? is presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production and theme music by Jade Bailey. Managing editor: Jacob Jarvis. Group editor: Andrew Harrison. Artwork by James Parrett. Additional music is from Artlist.io. WHY? is a Podmasters Production.    Instagram | X | Threads | Bluesky Learn more about your ad choices. Visit podcastchoices.com/adchoices

Most of us could list a few physical attributes for our ideal romantic partner – like preferring blondes or men over 6ft tall. But is having a ‘type’ real? If so, how does it develop? Is it biological, or socially constructed? And is the rhetoric of ‘types’ actually dangerous?     Emma Kennedy speaks to University of California Davis Psychology Professor Paul W. Eastwick, and Not My Type: Automating Sexual Racism in Online Dating author and University of Michigan Assistant Professor Apryl Williams, about the psychology and sociology of who we’re attracted to.     Buy Apryl’s book Not My Type: Automating Sexual Racism in Online Dating through our affiliate bookshop and you’ll help fund Why? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too.  Listen to Paul's new podcast Love Factually here.   WHY? is presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production and theme music by Jade Bailey. Managing editor: Jacob Jarvis. Group editor: Andrew Harrison. Artwork by James Parrett. Additional music is from Artlist.io. WHY? Is a Podmasters Production.    Instagram | X | Threads | Bluesky Learn more about your ad choices. Visit podcastchoices.com/adchoices

The Moon captivates the human imagination, inspiring artistic creativity, religious fervour and scientific exploration. But what if it were destroyed in some cosmic accident – or by scientific meddling? What would happen to the Earth and its inhabitants? And could humanity survive without it?     Emma Kennedy talks to two space experts – award-winning astrophysicist Professor Ethan Siegel and astronomy journalist Dr. Stuart Clark – about the implications of an enormous cosmic event.      Check out Ethan's Starts with a Bang blog here.   Buy Stuart Clark's Beneath the Night: How the Stars Have Shaped the History of Humankind and Ethan Siegel's Infinite Cosmos through our affiliate bookshop and you’ll help fund WHY? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too.      WHY? is presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production and theme music by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Additional music is from Artlist.io. WHY? is a Podmasters Production.       Instagram | X | Threads | Bluesky Learn more about your ad choices. Visit podcastchoices.com/adchoices

Most of us think we’re too smart, stable and strong-willed to join a religious cult, or to cut ourselves off from our families to join a group devoted to a charismatic leader. But clearly somebody’s joining them. So why do people willingly give up their free will and independence to join cults? Do they realise what they’re getting themselves into? And how do they get out? Emma Kennedy is joined by world-leading cult deprogrammer Rick Alan Ross and NXIVM cult survivor Sarah Edmondson to explore the strange allure of the cult mindset.    Buy Sarah Edmondson’s book Scarred: The True Story of How I Escaped NXIVM, the Cult That Bound My Life through our affiliate bookshop and you’ll help fund WHY? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too.    You can watch Sarah’s fantastic Ted Talk here. WHY? is presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production and theme music by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Additional music is from Artlist.io. WHY? is a Podmasters Production.     Instagram | Twitter | Threads | Bluesky Learn more about your ad choices. Visit podcastchoices.com/adchoices

From Terminators and Cylons to the War Droids from Star Wars, military robots are staples of science fiction. But they’re already here in the real world too. The US, China and Russia are all investing efforts into military machines – but they won’t be the gun-toting humanoids we see onscreen. Would taking human fighters off the battlefield increase the peace? Or should we be gravely concerned about this new era of international war?   Today on Why?, Emma Kennedy speaks to Kelsey Atherton, an award-winning military-tech journalist and Chief Editor of the International Policy Journal.     • “Militaries are deeply invested in the idea that things flow from the top.... The more autonomy you give a machine the harder it is to put in command and control.” - Kelsey Atherton  • “If a robot makes an error, it’s on the person who programmed it… these weapons are brought to battle with errors built in.” - Kelsey Atherton    WHY? is written and presented by Emma Kennedy. Produced by Anne Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production.    Instagram | Twitter  Learn more about your ad choices. Visit podcastchoices.com/adchoices

It’s been 52 years since humans last stepped onto the moon, and NASA is determined to set up a permanent base there. But there are huge challenges to overcome - not least surviving brain-damaging solar radiation and bone-wasting partial gravity.   Today on Why?, Luke Turner speaks to Clive Neal, Professor of Planetary Geology at Notre Dame University currently working with NASA on their next moon mission and find out exactly how they plan to build a long-lasting habitat.     • “What we’ve learned during and since Apollo, is that the moon is a very hostile environment, but now we understand the nature of that hostility. And that understanding is key to being able to keep humans alive on the surface of the moon – not only to survive, but to thrive.” - Clive Neal  • “Radiation and humans don’t miss in the long term. Radiation is much more intense in the lunar environment. So a human habitat on the moon would have to be buried beneath about two meters of regolith to protect them.” - Clive Neal    Written and presented by Luke Turner. Produced by Anne-Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production.  Learn more about your ad choices. Visit podcastchoices.com/adchoices

Most of us would like to live for as long as possible, given we’re in good health. But the definition of a long life is changing, and the rapid advancement of anti-ageing technologies could transform the idea of immortality from fantasy to reality. So the question isn’t so much can we live forever, but should we? Anna Machin talks to Dr Stephen Cave, Director of the Institute for Technology and Humanity at the University of Cambridge, and co-author of Should You Choose To Live Forever? A Debate, to find out. • “If we’re serious about pursuing longer lives, we have to get really, really serious about making those lives sustainable”. • “With life-extension and anti-ageing technologies, the effects will be enormous. Many of them will be beyond what we can imagine right now. If we’re going to pursue them, we need to think of what we can do to maximise the benefits, and manage the risks.” WHY? is written and presented by Anna Machin. Produced by Eliza Davis Beard and Anne-Marie Luff. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

Humanity has always been fascinated by the prospect of living on another planet – and our nearest neighbour is the prime candidate. Could we create livable space on Mars? What would we take with us? How would our lives be different? And how would human society change? As climate change and war make the question more urgent, we ask: Could humans really live on Mars? Anna Machin talks to Why?’s first husband-wife duo, A City on Mars authors Kelly and Zach Weinersmith, about life for the first Martian settlers.   • “People talk about Mars as a backup for humanity. But if it means taking so many steps back on human rights, I don’t want that backup. Let’s wait until we can support everyone who is up there.” - Kelly Weinersmith  • “If we do send humans to Mars, it needs to be done very slowly. It probably won’t happen in my lifetime.” - Kelly Weinersmith  Buy A City On Mars through our affiliate bookshop and you’ll help fund WHY? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too. Written and presented by Anna Machin. Produced by Anne-Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Learn more about your ad choices. Visit podcastchoices.com/adchoices

With the news full of war, terror and natural disasters, it’s increasingly looking like the so-called Doomsday Preppers were on to something after all. But most of us still don’t have a clue what – or how – we’d do in a disaster scenario. So when catastrophe does strike, is there a science behind who is more likely to cope? And what can we do to increase our chances?   Luke Turner talks to Dr Sarita Robinson, Associate Dean at the University of Central Lancashire and an expert in survival psychology, to find out what it takes to survive when disaster strikes.     • “Our brain is very switched on to the idea of threats in our environment. Once we’ve established there’s something that will cause us harm, our bodies and brains are very quick to mitigate the risk.” - Dr Sarita Robinson  • “Cognitive flexibility and optimism are both really helpful to survival in emergency situations.” - Dr Sarita Robinson     WHY? is written and presented by Luke Turner. Produced by Eliza Davis Beard and Anne-Marie Luff. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production.    Instagram | Twitter  Learn more about your ad choices. Visit podcastchoices.com/adchoices

Everything goes extinct eventually. When will it be our turn? And will humans disappear because of shifting tectonic plates, catastrophic natural disasters, the earth being engulfed by the sun… or our own ruinous activities? Basically, how long have we got?  Dr. Henry Gee, senior editor at Nature and author of A Very Short History of Life on Earth, tells Olly Mann that it isn’t so much a question of if we will go extinct, but when and why.   • “My feeling is that humans will become extinct within the next 10,000 years or so.” – Dr. Henry Gee • “For most of human history, people have been living at a subsistence level. Populations of humans would become extinct quite regularly. Near-extinction is a feature of human evolution." – Dr. Henry Gee Buy A Very Short History of Life on Earth through our affiliate bookshop and you’ll help fund WHY? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too. WHY? is written and presented by Olly Mann. Produced by Anne-Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

You can trust what’s in front of your eyes, right? Turns out… not really. Everything we see is processed through a filter of our prior expectations. Our brains fill the gaps in the data they receive to create a “reality” that we can understand. If everything we see and hear is just a construct, are we all living in our own hallucinations?  Anil Seth, Professor of Cognitive and Computational Neuroscience at the University of Sussex and author of Being You: A New Science of Consciousness, explains our world of illusions to Olly Mann.  • “There is a real world out there – but we experience it as a construction. We never experience things as they really are. We experience the world as WE are, not as IT is.” – Anil Seth • “We think our brains are ‘reading out’ the world but it is totally the other way around… The brain is continually making predictions about what is out there.” – Anil Seth Buy Being You: A New Science of Consciousness through our affiliate bookshop and you’ll help fund WHY? by earning us a small commission for every sale. Bookshop.org’s fees help support independent bookshops too. https://uk.bookshop.org/a/13277/9781399804516 WHY? is written and presented by Olly Mann. Produced by Anne-Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

Music is a universal language, a connecting force during all of life’s highs and lows. But why does music make us emotional? From feelings of elation and melancholy, to unease and motivation - why and how does music play with not only our emotions, but our brains themselves? Catherine Loveday, Professor of Neuropsychology at the University of Westminster, joins Luke Turner to discuss the psychology of music, its impact on our memory and why our teenage music loves stay with us forever. • "Music is in masses of different areas of the brain, and when we look in brain scanners when people are improvising, performing, or listening to music we see huge amounts of activation” - Prof Catherine Loveday • “There is research that shows longer-term musical memories are robust, and are less likely to be impacted by conditions such as dementia than other memories” - Prof Catherine Loveday • "There is a theory that music was our communication tool from before we developed language” - Prof Catherine Loveday • "There is no consistency in what people choose as their favourite genre of music, everyone develops their own taste and love of particular types of music” - Prof Catherine Loveday WHY? is written and presented by Luke Turner. Produced by Jade Bailey. Managing editor: Jacob Jarvis. Group editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters production. Learn more about your ad choices. Visit podcastchoices.com/adchoices

Your dog is really clever, right? You understand one another. Every pet owner thinks this. But can our pets really communicate with us beyond the basic demands for food, walks and play? How is its mind constructed? What’s going on inside that furry head? Dr Juliane Kaminski, Associate Professor in Comparative Psychology and director of the Dog Cognition Centre at the University of Portsmouth, tells Emma Kennedy how we’re only just beginning to understand how dogs see and understand the world they’re living in.  • “Dogs have a huge motivation to look into our eyes, to maintain eye contact, which is not a trivial thing, because in the wild, a wolf would perceive this as a threat.”- Dr Juliane Kaminski • “We’ve created a creature that understands us in ways that no other animal does. Dogs are really good at making sense of our communication.” - Dr Juliane Kaminski WHY? is written and presented by Emma Kennedy. Produced by Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

They shine as brightly as a trillion stars, they’re powered by supermassive black holes… and until 2023 we had no idea how they came into existence. These are quasars, awesomely powerful cosmic objects at the centre of some of the most violent events in the universe. What exactly are quasars, and just how powerful can they be? Dr Vicky Fawcett, Research Associate in Astrophysics at Newcastle University, explains the power of the quasar to amazed space cadet Luke Turner.  •“A Quasar can be about a thousand times more powerful than the Milky Way Galaxy itself.” - Dr Vicky Fawcett  •“Quasar stands for quasi stellar radio source, because back in the 1960s when they were first discovered, they thought they were radio bright stars.” - Dr Vicky Fawcett •"The central point of a quasar is so bright that they outshine all the stars in the galaxy.” - Dr Vicky Fawcett WHY? is written and presented by Luke Turner. Produced by Anne-Marie Luff with Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

If you could control your dreams, what would you do while you slept? Fly? Get romantic with some unattainable object of desire? Or embark on a fantasy odyssey with no equivalent in reality? Lucid dreams – where we know we’re dreaming and we can control what we do – come to many of us  at some point in our lives. But can we learn how to do it? And does lucid dreaming have real-world benefits beyond just being loads of fun?  Olly Mann talks to Mark Blagrove, Professor of Psychology and Director of the Sleep Lab at Swansea University, all about the science of lucid dreaming.  • “Lucid dreaming gives you something quite extraordinary to think about. It can increase your level of awe at what is possible in the world.” - Mark Blagrove • "People who frequently lucid dream have an ‘internal locus of control’, meaning that they feel in charge of their own life, as opposed to feeling that their life is under the control of chance.” - Mark Blagrove WHY? is written and presented by Olly Mann. Produced by Anne-Marie Luff and Eliza Davis Beard. Audio production by Jade Bailey. Managing editor: Jacob Jarvis. Group Editor: Andrew Harrison. Artwork by James Parrett. Music by DJ Food. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

You’ve probably eaten something so spicy it hurt before. But, across the globe, people still love eating spicy food – despite the discomfort. Why? Bob Holmes, author of FLAVOR: The Science of Our Most Neglected Sense, tells Olly Mann what attracts us to this taste sensation.  Every Monday and Thursday WHY? takes you on a wild adventure to the edge of knowledge. Follow on your favourite app so you never miss an episode. WHY? is written and presented by Olly Mann Audio production by Jade Bailey. Artwork by James Parrett. Music by DJ Food. Exec Producer: Jacob Jarvis. Lead Producer: Anne-Marie Luff. Group Editor: Andrew Harrison.  WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

Without warning a 7.6 magnitude earthquake shook Japan on New Year’s Day, raising the sea floor above the water and causing devastating damage and death. Even with all humanity’s deep scientific knowledge and discoveries, we still cannot predict when an earthquake will strike. Why is that? What mysteries do the earth’s tectonic plates hold, and are we getting closer to solving them? Professor Tim Wright tells Emma Kennedy how scientists are working to relieve the seismic strain on the earth’s mantle – and new discoveries about the shifting world beneath our feet. Every Monday and Thursday WHY? takes you on a wild adventure to the edge of knowledge. Follow on your favourite app so you never miss an episode. WHY? is written and presented by Emma Kennedy. Audio production by Jade Bailey. Artwork by James Parrett. Music by DJ Food. Exec Producer: Jacob Jarvis. Lead Producer: Anne-Marie Luff. Group Editor: Andrew Harrison.  WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices

If you’ve ever watched Jurassic Park, you’ve probably wondered how you’d fare against a dinosaur. If these prehistoric beasts did exist alongside us, would we really stand a chance?  Today on Why? Dr. David Hone separates dinosaur fact from fiction with Emma Kennedy, including the secrets held in dino-dandruff. Every Monday and Thursday WHY? takes you on a wild adventure to the edge of knowledge. Follow us on your favourite app so you never miss an episode. WHY? is written and presented by Emma Kennedy. Audio production by Jade Bailey. Artwork by James Parrett. Music by DJ Food. Exec Producer: Jacob Jarvis. Lead Producer: Anne-Marie Luff. Group Editor: Andrew Harrison.  WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices