CrowdScience

How do we hear a sound and immediately know where it’s coming from? That’s the question that CrowdScience listener Chiletso asked himself one day as he heard his son bounce a ball and instantly knew its direction. In this ear-opening episode, presenter Anand Jagatia sets out to discover what makes left, right, up and down, sound so different.First, Anand gets blindfolded, so that Alan Archer-Boyd, former auditory scientist and lead engineer at BBC R&D, can put his sound localisation skills to the test. It turns out that having two ears and pinnae, those flappy bits of cartilage on the side of your head, help a lot. Professor Eric Knudsen shares how the barn owl’s asymmetrical ears allow it to hunt mice, even in complete darkness.And Anand uncovers how far he can push his own spatial hearing. Blind activist and researcher Thomas Tajo teaches him how to echolocate like a bat, and Dr Lore Thaler explains what is going on in the brain of experienced echolocators.If you can, listen on headphones!Presented by Anand Jagatia Produced by Florian Bohr for the BBC World ServiceImage: Boy with hands at his ears Credit: Silke Woweries/Getty Images

Sweating, nausea, chest pain and shortness of breath sound like the physical symptoms of a heart attack. For about 4% of the world’s population, they are also symptoms of an underdiagnosed condition that can leave sufferers curled in a ball and screaming on the floor. A CrowdScience listener wants to know why humans have panic attacks. Host Marnie Chesterton brings on board an expert co-presenter, novelist Tim Clare, to talk us through the hows and whys. Tim suffered from crippling panic attacks for over a decade. He decided enough was enough and has combed through the scientific literature, using himself as a guinea pig, to see what helped. Anxiety can be a useful sensation, helping you to detect and avoid dangers before they happen. But when that morphs into debilitatingly unpleasant symptoms, or an internal monologue saying “that’ll go badly, best to not leave the house”, something has gone wrong. Together, Tim and Marnie explore what’s going on in the brains of those whose threat circuit is faulty. Dr Olivia Remes, a mental health researcher at the University of Cambridge explains how common panic attacks are, and how they often present. Dr Bonnie Furzer at the University of Western Australia explains how exercise can help. Tim takes a dip to demonstrate how cold water, and the cold shock response can help. Dr Rebecca Taugher at the University of Iowa explains how scientists induce a panic attack in the lab, how she has been a guinea pig and why patient SM, without an amygdala, the brain’s so-called ‘fear-centre’, could still be given a panic attack in the lab, just by inhaling extra amounts of carbon dioxide. Professor Alexander Shackman from the University of Maryland points out that the science will come so much further when researchers look at a genuine cross-section of the population, rather than focussing on those in educational establishments (easier to study) who often don’t experience panic attacks. PHOTO CREDIT: Woman hyperventilating into paper bag Credit: Peter Dazeley/Getty Images

When imagining a robot, a hard-edged, boxy, humanoid figure may spring to mind. But that is about to change.CrowdScience presenter Alex Lathbridge is on a mission to meet the robots that bend the rules of conventionality. Inspired by how creatures like us have evolved to move, some roboticists are looking to nature to design the next generation of machines. And that means making them softer. But just how soft can a robot really be?Join Alex as he goes on a wild adventure to answer this question from listener Sarah. He begins his quest at the ‘Hello, Robot’ Exhibition at the Vitra Design Museum in Weil am Rhein, Germany to define what a robot actually is. Amelie Klein, the exhibition curator, states anything can be a robot as long as three specific criteria are met (including a cute cuddly baby seal). With this in mind, Alex meets Professor Andrew Conn from the Bristol Robotics Lab who demonstrates how soft materials like rubber are perfect contenders for machine design as they are tough to break and - importantly for our listener’s question - bendy. Alex is then thrown into a world of robots that completely change his idea of what machines are. He is shown how conventionally ‘hard’ machines are being modified with touches of softness to totally upgrade what they can do, including flexible ‘muscles’ for robot skeletons and silicon-joined human-like hands at the Soft Robotics Lab run by Professor Robert Katzschmann at ETH Zurich. He is then introduced to robots that are completely soft. Based on natural structures like elephant trunks and slithering snakes, these designs give robots completely new functions, such as the ability to delicately pick fruit and assist with search and rescue operations after earthquakes. Finally, Alex is presented with the idea that, in the future, a robot could be made of materials that are so soft, no trace of machine would remain after its use... Presenter: Alex Lathbridge Producer: Julia Ravey(Image: RoBoa in action on a rooftop in Zurich. Credit: Julia Ravey)

CrowdScience listener Eric, in New Zealand, has noticed his wisteria growing towards a neighbouring tree. He thinks that it actually knows where it’s going. But how can a plant have a sense of direction?Plants don’t have the advantage of brains or eyes, but that doesn’t seem to stop them from being clever enough to find out from their environment where to move and how to get there – all while being rooted to the spot.Marnie Chesterton visits the Natural History Museum and Kew Gardens in London, home to the largest collection of living plants in the world, to discover how plants make their manoeuvres, and talks to botanists and plant biologists for the latest findings on the mysterious life of climbing plants.Featuring:Dr Mariane Sousa-Baena, School of Integrative Plant Sciences, Cornell University Dr Ilia Leitch, Senior Research Leader, Kew Gardens Tom Freeth, Head of Plant Records, Kew Gardens Dr Silvia Guerra, Neuroscience of Movement Laboratory, Padua University Professor Christian Fankhauser, Centre for Integrative Genomics, Lausanne University Dr Sandra Knapp, Merit Researcher, Natural History Museum

If, like this week’s Crowdscience listener Lili, you’re an avid gymgoer, you may well have wondered where your fat disappears to when you exercise? Well, the short answer is that we convert it to energy that powers a whole range of physical processes, from breathing to walking as well as lying down and doing nothing. But the science behind energy expenditure is a little more complicated than that. Presenter Anand Jagatia pops on an exercise bike to have his metabolism measured, and learns that he may be relying on an entirely different source of fuel as he works up a sweat. But is all that hard work worth the effort it involves? Recent research suggests there's a limit to the number of calories us humans can burn, and that doing physical activity isn’t a sure-fire way to keep trim. Even hunter-gatherers who walk 13,000 steps a day have the same metabolic rate as the average American. So if working out isn't the best way to lose weight, how about harnessing our own fat to tackle the complications of obesity? It used to be thought brown fat was exclusive to babies (and bears) but we now know adults have some of it too, and it seems to play a vital role in combatting a range of chronic diseases including hypertension and diabetes.Presenter: Anand Jagatia Producer: Marijke Peters

Yoga benefits our health in many ways, say the yogis, but which claims are backed up by science? Can yoga actually alleviate depression, fix lower-back pain or even reduce cardiovascular disease?Presenter Marnie Chesterton gets into her Lotus (position) and finds out first-hand at a class. Whilst in warrior one, she discusses the potential physical and mental health benefits of this ancient art of stretching, balance and movement with her class teacher. Returning from mat to studio, Marnie puts some of those claims to experts around the globe. She investigates the evidence to find out whether health boosting properties are the key to yoga's enduring popularity.Pannalists: Rajvi Mehta Prof. Holger Cramer Dr Richard DavidsonPresented by Marnie Chesterton Produced by Richard Walker

Why does the thought of giving a talk to an audience fill so many of us with sheer terror? Marnie Chesterton investigates for listener Nhial, who has seen his fellow students in Morocco become panic stricken at the prospect and wants to know the reason for our anxiety. According to one study, 77 per cent of us share that fear. Marnie finds out about the relationship between stress, our brains and our voices from research associate Dr Maria Dietrich at the University Hospital, Bonn University. She talks to Nhial’s tutor, Professor Taoufik Jaafari, at Hassan II University of Casablanca about the challenges facing his students. And she visits the National Theatre in London to get some expert training from Jeannette Nelson, head of voice, who works with some of the world’s leading actors.Could there be an evolutionary explanation for the purpose of public speaking? Is it something we actually need to be good at? Marnie asks evolutionary psychologist Professor Robin Dunbar at Oxford University and gets some surprising answers. She meets psychologist Dr Preethi Premkumar at London South Bank University, who has developed virtual reality therapy with colleagues at Nottingham Trent University, and tries out the treatment herself.Presenter: Marnie Chesterton Producer: Jo Glanville

We generate a huge amount of noise, whether it’s our rumbling roads, pumping parties, or talkative tourists. And the topic of noise also generates a lot of questions from our listeners. In this episode we explore three of them, with the help of acoustic scientist Kurt Fristrup and neuropsychologist Catherine Loveday.Listener Dominique finds it hard to experience even one minute of a natural soundscape without some intrusion of human-made noise. He wonders how noise pollution is affecting both the natural world and us humans. We discuss just how noisy our modern world is, and visit a National Park in California to hear how they’re encouraging more peace and quiet there.Meanwhile Michelle, having witnessed her husband wince in pain at the sound of squeaking takeaway boxes, asks why certain noises are particularly unpleasant or even painful to some people.And finally, Jennifer has a sonic mystery for us to solve: why does the time of day make such a difference to the distant noises reaching her remote home?With contributions from Professor Catherine Loveday, Dr Kurt Fristrup and Mia Monroe.Additional audio courtesy of the U.S. National Park Service/Patrick Myers, Dominique Laloux, Boise State University/Jesse Barber, and KCSU/Asher KornPresenter: Anand Jagatia Producer: Cathy Edwards Studio Managers: Bob Nettles and Jackie Margerum

From Lawrence of Arabia to Star Wars via tales of intrepid adventurers traversing lonely sand-swept landscapes, deserts have always had a powerful pull on the popular imagination. But if a desert is full of sand, where did all that sand come from in the first place? That is what CrowdScience listener Andy wants to know, so presenter Caroline Steel heads off into the dunes to find out.She begins by finding out what a desert is anyway and whether it is always sandy, as well as tracing the flow of material across the huge, ever-shifting sand seas of the Sahara.From deserts fed by sand from mountains thousands of kilometres away, to dunes migrating across the entire continent of Africa, Caroline discovers how sand has just the right properties to be carried along by the wind. She also explores how the sand in every desert has a unique fingerprint, and finds out how fish bones in the Sahara tell the story of its lush, green past.Contributors: Dr Jo Nield, University of Southampton Dr Andreas Baas, Kings College London Dr Andrea Zerboni, University of MilanPresented by Caroline Steel Produced by Ben Motley for the BBC World Service(Photo: The Sahara desert near Timbuktu, Mali Credit: Jeff Overs)

When falling in love or fancying someone, one emotion can dominate over the rest: jealousy. Some may try to play it cool and act aloof, but seeing - or even thinking - of a romantic partner engaging with others can lead people to act completely out of character. The green-eyed monster can hijack thoughts for days to weeks on end, making us spend precious energy ruminating on situations that may never arise. So why is it that humans feel jealousy? Do people experience this emotion differently? And are there ways to stop it?CrowdScience presenter Caroline Steel sets about answering these questions from listener Odile in France, who has struggled with all-consuming jealousy in some romantic relationships. She hears about a kind of monkey that gets jealous of its own reflection from Professor Karen Bales at University California Davis. A trip to ZSL London Zoo sees more monkeys, but these are more bothered about protecting the vital friendships which aid their survival. Dr Alex Mielke from the University of St Andrews explains how these interactions can give us an insight into why jealousy exists. Some of us get more jealous than others and are more likely to act out of character when the green-eyed monster takes hold. Caroline completes a detailed questionnaire to see how jealous she really is, and gets advice from Julia in South Africa, who is in a polygamous marriage and has had to handle romantic jealousy. The nature-nurture balance of jealousy is untangled by geneticist Dr Laura Wesseldijk from Amsterdam UMC (who reveals some surprising information about the first author on her research paper…) and psychologist Dr Johan Ahlen from the Karolinska Institute rounds off the programme by discussing what the future of jealousy management could look like for those who struggle.Presenter: Caroline Steel Producer: Julia Ravey