263 episodes

We take your questions about life, Earth and the universe to researchers hunting for answers at the frontiers of knowledge.

CrowdScience BBC

    • Science
    • 4.3 • 4 Ratings

We take your questions about life, Earth and the universe to researchers hunting for answers at the frontiers of knowledge.

    Which is better: optimism or pessimism?

    Which is better: optimism or pessimism?

    In most cultures, the soundtrack to our lives is one of optimism. We're told to aim for the stars, dream big and believe that tomorrow will definitely be a better day. But why do so many people subscribe to the cult of 'glass half full' when life’s hardships should make any reasonable person a bit more wary?

    Listener Hannah from Germany - a self-described pessimist - is intrigued as to whether the alternative, optimistic way of life is really the best way to be. Cheerily taking on the challenge is ray of sunshine Marnie Chesterton, who finds out why 80% of the population have an optimism bias and how the ability to hope and take risks may have helped the human species get where it is today. She also meets a man who pushes the optimistic outlook to its very limits - BASE jumping world champion, Espen Fadnes. Listener Hannah on the other hand looks into the psychology of pessimism to find out if there are any advantages to her less rose-tinted view on life - and whether the culture we grow up in shapes how realistically we see the world.

    CrowdScience asks whether optimism or pessimism is the answer to a happy life.
    Produced by Caroline Steel and presented by Marnie Chesterton for the BBC World Service.

    Espen Fadnes – Freefall professional
    Tali Sharot – Professor of neuroscience, UCL
    Julie Norem - Professor of psychology, Wellesley College
    Jeanne Tsai - Professor of psychology, Stanford

    [Image credit: Getty Images]

    • 32 min
    Would my cat survive in the wild?

    Would my cat survive in the wild?

    Cats started hanging out with humans thousands of years ago, and nowadays these fluffy, lovable pets are found in many of our homes. But there is no doubt lots of them still have keen hunting instincts - witness all the birds and small mammals they kill each year.

    CrowdScience listener Rachel started wondering whether her cat Eva could fend for herself while watching her uncoordinated swipes at a toy on a string, and seeing her fall off the sofa. Even though Eva was once a stray, she now lives entirely indoors, and it is hard to imagine her holding her own back on the mean streets. But could this pampered pet recover her survival instincts? Or would she go hungry, or fall foul of other cats or predators?

    Cat behaviour expert Roger Tabor is on hand with answers. His pioneering ‘cat-navs’ shine a light on what cats get up to inside and outside the home; we meet one of his subjects, a tiny cat with a fierce personality. Roger explains how a cat’s survival toolkit depends on their sex, breed, and above all their early life. Environment matters, too, so in Japan, where Rachel and her pet cat live, we visit a cat shelter to learn about the day-to-day challenges stray cats face.

    And just how ‘domestic’ are our cats, anyway? How different are they from their wildcat cousins, and how did they come to be our companions in the first place? It turns out beguiling humans might be even more of a survival trick than hunting.

    Presenter: Melanie Brown
    Producer: Cathy Edwards

    Roger Tabor – Chartered Biologist and Cat Behaviourist
    Jamie Baker – Head Keeper, Battersea Park Children’s Zoo
    Dr Eva-Maria Geigl – Research Director, CNRS (French National Centre for Scientific Research)
    Susan Roberts and Cheryl Nodhturft-Mori – Japan Cat Network

    (Image: Cat in Lion costume. Credit: Getty Images)

    • 30 min
    Can we recycle concrete?

    Can we recycle concrete?

    Concrete is the most widely used substance on earth after water. It’s quite literally the foundation of the modern world, and no wonder - it’s strong, cheap, and mouldable into nearly any shape.

    But these benefits come at a cost: concrete production is responsible for around 8% of global CO2 emissions - that’s around three times more than the aviation industry.

    Concrete might not look pretty, but given its carbon footprint, should we be more careful about how we use it? And rather than throwing waste into landfill, could we recycle it instead? That’s what Crowdscience listener Catherine wants to know.

    To investigate, Marnie Chesterton and Anand Jagatia learn more about what makes concrete such a brilliant and versatile material. It’s down to the chemistry of how cement dries – which, it turns out, is anything but boring. They find out how the stuff is made, and why that produces so much carbon. And they hear about some ingenious projects to repurpose demolition waste – including creating underwater habitats for marine life, and using 3D printers to turn crushed concrete into street furniture.

    With Prof John Provis, Prof Becky Lunn, Chris LaPorta, Sheryl Lee, Dr Edward Randviir and David Lacy

    Presented by Marnie Chesterton and Anand Jagatia.
    Produced by Anand Jagatia for BBC World Service

    [Image: Discarded Concrete, Credit: Getty Images]

    • 26 min
    Can COP26 deliver on climate change?

    Can COP26 deliver on climate change?

    The science is unequivocal: human-made climate change is leading the world into an environmental crisis, and time is running out to prevent permanent damage to ecosystems and make the planet uninhabitable for many of us humans.

    As communities around the world increasingly experience the devastating effects of global warming, world leaders, policy makers and scientists from all over the globe are attending COP26, the United Nation’s major climate summit in Glasgow, Scotland. Each nation will be frantically negotiating its commitments to tackling emissions - many agree it’s a pivotal moment for the future of humanity.

    Crowdscience hosts a panel of three experts taking part in the conference, to hear their thoughts on what progress has been made so far. They answer listener questions on rising sea levels, explaining that a temperature rise of more than 1.5 degrees won’t just affect small island nations but will have serious consequences for every country in the world. We hear about an interactive atlas developed by the Intergovernmental Panel on Climate Change (IPCC) that shows the impact of higher temperatures in different regions.

    And presenter Marnie Chesterton asks about the financial barriers that have prevented many people from traveling to COP26 and discovers why it’s vital that people from the global south have their voices heard.


    Ko Barrett, Vice-chair of the Intergovernmental Panel on Climate Change (IPCC)
    Dr Saleemul Huq, Director of the International Centre for Climate Change and Development in Bangladesh(ICCCAD)
    Dr Tara Shine, Director of Change By Degrees

    Produced by Melanie Brown and Marijke Peters for BBC World Service.

    [Image: Delegates in the Action Zone at COP26 UN Climate Summit, Glasgow. Credit: Getty Images]

    • 39 min
    Could we completely switch to renewable energy?

    Could we completely switch to renewable energy?

    As the world slowly moves away from using fossil fuels for electricity, one tiny Scottish island has proved it’s possible to rely almost entirely on renewables.

    The inner Hebridean isle of Eigg used to get its power from diesel generators. But in 2008 its residents launched the world’s first electricity system powered by nature, and the Crowdscience team wants to know exactly how they did it, and whether such a model could work in other places with no national grid? Marnie discovers that the community is key to the success of this project, meeting the maintenance men who taught themselves to install equipment and solve any problems themselves, and hearing from residents who’ve changed their habits to use less juice. With the mainland more than an hour away by a once-daily ferry, this kind of resourcefulness is vital. Hydroelectric generators harness the power of running water and are complemented by wind turbines and solar panels on peoples roofs, meeting 95% of Eigg’s energy needs. Now others are learning from this unique experiment and we meet the Malawians who were inspired after visiting Eigg. A solar grid in the village of Sitolo has provided power to thousands of people, and the people who designed it are planning others.

    Thanks to Eigg residents: Sue Hollands, Maggie Fyfe, Eddie Scott, Bob Wallace, Greg Carr

    Presented by Marnie Chesterton
    Produced by Marijke Peters for BBC World Service.

    This episode of CrowdScience has been edited to correct a factual error

    Image: Wind turbines on Eigg Credit: Getty Images

    • 34 min
    Should I have kids?

    Should I have kids?

    "To be or not to be” was never your decision. No one alive today is an “exister” by consent - your parents made that call for you. But who can blame them? Animals are hardwired with strong impulses towards their procreative goals, and we humans, by and large, are no different. But for some conscientious people alive today, this most fundamental of biological impulses is butting up against a rational pessimism about the future...

    With apocalyptic scenes of natural disasters, rising sea levels and global pandemics causing existential dread and actual suffering, it's understandable that CrowdScience listener Philine Hoven from Austria wrote to us asking for help her make sense of what she sees as the most difficult question she faces - should she have children?

    In this episode, presenter Geoff Marsh helps Philine to predict what kind of a world her hypothetical child might inhabit, and explores the impact their existence, or indeed non-existence might have on society and the planet. Plus, we'll explore what ‘antinatalism’- a philosophical stance which argues against procreation, can tell us about the moral landscape of the unborn. With Ms Caroline Hickman, Professor Mike Berners-Lee, Professor Noriko Tsuya and Professor David Benatar.

    Presented and produced by Geoff Marsh for BBC World Service

    • 36 min

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