CrowdScience dives back into a debate about trees and their ability to tackle air pollution. Growing trees take in carbon dioxide and emit oxygen, but their leaves also attract tiny particles, which can get into our lungs and brains. So how good are they at cleaning our clogged up skies? Following on from our original programme, CrowdScience was contacted by a team of researchers in the UK who claim tress may be as much as 50 times better than previously thought at mopping up particles, and learn that hedges may help us stay healthy on roads. Also in the programme, we discover what pollutants are doing to our brains and reveal research which shows that keeping house plants can significantly reduce pollution inside the home.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
CrowdScience heads to the Sydney Science Festival in Australia where, from a special event at The Powerhouse Museum, we reveal answers to questions listeners have been sending in such as: What living thing has the most toxic venom? What is déjà vu? And why do our fingers wrinkle in the bath? To tackle our listeners’ questions about life, Earth and the universe, presenter Marnie Chesterton is joined by four special guests who will bring the good, weird and bemusing from the world of science to the stage.
Prof Shari Forbes, Professor in Forensic Science at the University of Technology Sydney,aims to help police and forensic teams establish a more precise time of death in missing person and homicide cases.
Dr Katie Mack is an astrophysicist at the University of Melbourne. Her work focuses on finding new ways to learn about the early universe and fundamental physics using astronomical observations.
Dr Jonathan Webb runs the science unit at ABC RN. He is also a former neuroscientist and a former science reporter for BBC News in London.
Dr Alice Williamson is a chemistry lecturer and researcher at The University of Sydney. She hosts a weekly science segment, Up and Atom on FBi Radio in Sydney, co-hosts RN’s Dear Science, and is a regular guest on Dr Karl's Shirtloads of Science podcast.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Presenter: Marnie Chesterton
Producer: Marijke Peter and Jen Whyntie
Is it possible to get power from lightning? This was the first CrowdScience question posed by listener John Emochu in Kampala, Uganda, in November 2016. We revisit John’s story as presenter Marnie Chesterton goes hunting for answers at a lightning lab in Cardiff, Wales, where she discovers just what lightning lab is, and how to make a tiny – but very loud – lightning bolt. And we tackle the best of the many questions that came into our inbox about thunderstorms after the original broadcast – from how many types of lightning exist to whether antennae in the clouds could gather electricity. Finally, we head to Kampala to meet listener John to hear just what he thought of the programme and what life is really like in one of the lightning capitals of the world.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Presenter: Marnie Chesterton
Producer: Jen Whyntie
(Image: Artist impression of lightning inside a conical flask. Credit: Getty Images)
As a species, we humans can be uniquely horrible to our own kind. But are we the only animal to commit murder? Listener Michelle’s question sends CrowdScience trekking – and getting lost - in the Budongo rainforest in Uganda in search of one of Man’s closest relatives, the chimpanzee.
We hear from the scientists, who only days before the team’s arrival at the camp, witnessed a gang of chimps brutally killing another adult. But does chimpanzee lethal aggression pass muster as murder? We head to the capital Kampala for some legal advice and take a look at the grim history of putting animals on trial.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Presenter: Geoff Marsh
Producer: Louisa Field
(Image: Closeup of angry chimpanzee Credit: Getty Images)
The system that runs the ride-sharing company Uber doesn’t just link up passengers and drivers based on price. It also has to connect the two based largely on where they are geographically. It is, says Nobel laureate Stanford economist Alvin E. “Al” Al Roth, a matching market.
In this Social Science Bites podcast, Roth explains to interview David Edmonds some of the ins and outs of market matching, starting with a quick and surprisingly simple definition.
“A matching market is a market in which prices don’t so all the work,” Roth details, “So matching markets are markets in which you can’t just choose what you want even if you can afford it – you also have to be chosen.” But while the definition is simple, creating a model for these markets is a tad more complex, as Roth shows in offering a few more examples and contrasting them with commodity markets.
“Labor markets are matching markets. You can’t just decide to work for Google – you have to be hired. And Google can’t just decide that you’ll work for them – they have to make you an offer.” And like say university admission, matching markets require something to intervene, whether it be institutions or technology, to make this exchange succeed. In turn Roth himself helped engineer some high profile matches in areas where the term ‘market might not traditionally have been used: kidney donors with the sick, doctors with their first jobs, or students and teachers with schools. Or even the classic idea of ‘matchmaking’ – marriage.
Roth turned to game theory to help explain and understand these markets, and his work won he and Lloyd Shapley the 2012 Nobel Memorial Prize in Economic Sciences. As the Nobel Committee outlined:
"Lloyd Shapley studied different matching methods theoretically and, beginning in the 1980s, Alvin Roth used Lloyd Shapley's theoretical results to explain how markets function in practice. Through empirical studies and lab experiments, Alvin Roth demonstrated that stability was critical to successful matching methods."
Roth is currently president of the American Economics Association, and sits as the Craig and Susan McCaw professor of economics at Stanford University. He is also the Gund professor of economics and business administration emeritus at Harvard University
How do we end up speaking the way we do? What's happening in our brains and mouths to make us sound so different from each other - even when we’re speaking the same language? This week on CrowdScience we return to our listener Amanda’s question of why there are so many accents, and discover more about what our accents say about us.
We visit Glasgow in Scotland, home to one of the most distinctive dialects of English, to see how social status and age affect the way we speak; and investigate another of our listeners’ questions: is there really such a thing as a ‘political accent’?
But how do babies pick up accents in the first place – and is it impossible to learn new sounds later in life? Presenter Nastaran Tavakoli-Far discovers something unexpected about her own accent, visits a voice coach to try and sound Texan, and uses ultrasound to try and get her tongue round new sounds.
And you can find out how much of an accent expert you are, by taking part in our online quiz.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Presenter: Nastaran Tavakoli-Far
Producer: Cathy Edwards
(Image: Woman holds hand near ear and listens carefully alphabet letters flying in. Credit: Getty Images)
People said they’d never catch on. Mobile phones, the internet and even robot assembly lines all once seemed like niche technologies. But today they are at the heart of the modern world.
But just how far can technology go? Could machines start to compete with humans in making complex and life-changing decisions, like those made by lawyers and judges? That’s what CrowdScience listener Zackery Snaidman from Orlando in the US wants to know and presenter Marnie Chesterton has set out to find answers.
She starts at a hackathon in London, where she witnesses the birth and design of the UK’s new online court. And in Uganda, she hears how technology and social media is filling a crucial gap left by a shortage of human lawyers. Marnie is also surprised to discover a simple algorithm that regularly out-performs human judges in making bail decisions.
But could technology bring as many problems as it solves? Could seemingly ‘unbiased’ computers hide the prejudices of their makers? And more fundamentally: With our future liberty at stake, is the world ready to leave their fate in the hands of machines?
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Presenter: Marnie Chesterton
Producer: Anna Lacey
(Image: Digitized Lady Justice. Credit: Getty Images)
A billion people across the world smoke cigarettes, and many would agree it’s the hardest habit to quit. One such smoker, listener Sharif, emailed CrowdScience from Uzbekistan to ask if we could find out why giving up is so difficult. Marnie Chesterton travels to San Francisco to meet addiction experts and discovers how nicotine tricks smokers into thinking tobacco’s good for them. And we meet ex-smokers at a weekly therapy session aimed at retraining the brain.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Earlier this year Crowdscience explored the question of time. Back then we were on a mission to uncover what the real time is and how we're able to measure time to ever greater degrees of accuracy. But as ever, the programme uncovered more questions than answers so presenter Anand Jagatia is back to try and find out where time comes from, why it runs forwards and not backwards, what happens to time in a black hole and does time even exist beyond our experience of it? We speak to Claudia Hammond, author of a book that reveals the mysteries of time perception and the man who defined time for the online Encyclopaedia Britannica, tells us if time really exists or not.
Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk
Under normal circumstances, if something was hurting you, you’d likely stop doing it. Except, well, as Theresa Marteau of Cambridge University’s Department of Public Health and Primary Care has explored deeply, in some key areas, you’re likely not stopping.
In a conversation with Social Science Bites host David Edmonds, she notes that the majority of premature deaths are due to four non-communicable diseases – diabetes, cancer, cardio-vascular disease, and lung disease. In turn, there are four main causes of these diseases – smoking, overconsumption of food, alcohol, and not moving around enough. All those causes, you’ll notice, flow from behavior.
And simply tapping someone on the shoulder and pointing out the connection has not been a particularly effective way to interrupt these pernicious behaviors.
“It’s quite a common idea that if people only understood better how they might be damaging their health, then they would tackle it,” Marteau explains. “Governments and others invest an amount of money in trying to communicate the risks to you and your health of engaging in these behaviors ... and while it can raise awareness, it’s not that effective at changing your behavior.”
That’s perplexing, Marteau admits, but undeterred she’s spent much of her career at the intersection of basic psychology, neuroscience and behavioral science looking for ways that do work to change behavior. And, as this podcast explores, she’s focused on the environment.
Or rather, environments.
As director of Studies for Psychological and Behavioural Sciences at Cambridge’s Christ’s College, her research group examines how environment – and that includes the cultural, built and financial environments --buttresses short term pleasures over long term benefits.
Taking a cue from Daniel Kahneman’s Thinking Fast and Slow, Marteau finds that the ‘bad’ behaviors in question ultimately—despite any initial enthusiasm at some point to quit smoking or go to the gym – default to the so-called ‘fast‘ brain system that oversees routine behaviors. These routines in turn are shaped, or perhaps amplified, by those environments.
Ultimately, Marteau focuses on addressing these harmful behaviors, work which this June saw her named Dame Commander of the Order of the British Empire for her services to public health. That work has her collecting evidence for redesigning environments to promote healthy behavior, which touches on public and private industry issues like product pricing, availability (and proximity), portion size, excise taxes, and many others -- “conceptually simple but legally and culturally more complex,” she admits.
