Category: ScienceNews

People often talk about being descended from apes. But go back a bit further and we have a more unlikely ancestor – fish. Improbable as it may sound, the creature that gave rise to every bird, reptile and mammal on Earth today lived a fully aquatic life.

So how did it switch to life on land? And how hard was it to swap swimming for walking and breathing fresh air? That’s what CrowdScience listener Pierre in France wants to know, and what Marnie Chesterton is in Scotland to find out. She goes fossil hunting with members of the TW:eed Project team, as they try to uncover remains of creatures that are crucial in helping solve the puzzle of terrestrial life. She also discovers the landscape these early ancestors walked into – an alien and relatively empty world completely different to what we see today - where grass and flowers were yet to evolve.

But not everything in this story is preserved in rock. Marnie goes to see a living relic of this period of evolution, and finds out what it can tell us about possibly the most important event in the history of our species.

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: Artists impression of underwater environment of Carboniferous swamp depicting a rhizodont; a large predatory fish. Credit: Mark Witton)

Is it just a low wage that conjures up the term when we talk about “crushing poverty”? Or is it really a host of other issues that likely accompany that lack of money? Economist Sabina Alkire has spent her career crafting the measures that demonstrate that latter proposition, work that with fellow economist James Foster resulted in what is known as the Alkire-Foster Method for determining level of poverty.

In this Social Science Bites podcast, Alkire – director of the Oxford Poverty and Human Development Initiative -- explains to interviewer Dave Edmonds the need to have a consistent and reputable means of measuring poverty over time. This usually entails “a monetary measurement, either income or consumption,” she details, “and a person is deemed to be poor if they don’t have enough by some poverty line.” 

But as noted above, this is only half the battle – or perhaps not even half.

“I’m not at all against income poverty level measures or consumption poverty measures, but it doesn’t tell the whole story,” Alkire explains (and notes that Foster is himself architect of some of those types of indices). “A person is also poor if they’re malnourished, and if their house is decaying and they don’t have a job and they’re not educated or their children are not attending school or if they’re victims of violence.”

What’s needed is “a more three-dimensional account,” even if that new method doesn’t perfectly correlate with traditional material measures. And so she and Foster, building on work by Nobel laureate economist Amartya Sen, created method to derive the Global Multidimensional Poverty Index. That index does not include income but does look at living standards across 10 dimensions. If someone is considered ‘deprived’ in more than a third of those 10 dimensions, they are officially identified as poor.  

Looking just at the globe’s 103 developing countries, Alkire says 1.45 billion people are “multidimensionally poor.” The mixed news, she adds, is that while levels of poverty are declining, the number of poor is increasing.

Knowing where people stand is important in a policy context, Alkire says, which makes having an “official permanent statistic” that will survive changes in government, and which is drawn from demographic and health surveys in public domain, important. So far, national-level multidimensional poverty indices have proven their worth in poverty alleviation efforts, with state level governors in Mexico, for example, vying to out-lower each other. (Alkire notes that national indices do vary from the global index due to regional variation: Bhutan uses a measure of a household’s distance from a road.)

Unpleasant man-made noise is something that disturbs many of us and even damages our health. But as millions more people move into crowded cities around the world, it's a cacophony that we almost unavoidably create ourselves. CrowdScience listener Diana from New York City in the USA got in touch to ask how we can temper the din and live a more peaceful life. Presenter Anand Jagatia heads to an acoustics lab at the University of Salford in Manchester, UK, to meet the researchers and engineers investigating the best ways to make cities more pleasant for our ears whilst still maintaining the ‘buzz’ of city life. And reporter Chhavi Sachdev takes us to Mumbai in India, where we discover how sound mapping is being deployed on the city’s streets as the first step to improve the life and health of its citizens.

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

Presenter: Anand Jagatia Producer: Jen Whyntie

(Image: Children cover their ears as the truck convoy front passes. Credit: Getty Images)

Is there any scientific proof of an afterlife? Six months ago, CrowdScience tackled a question from a listener who wanted to know whether there was life after death. But following more listener emails, presenter Marnie Chesterton returns to the subject to investigate the world of ghosts, souls and parapsychology. She meets Professor Susan Blackmore, who studies out-of-body experiences and has spent decades hunting for scientific proof of life after death. And she visits the woman who, despite dying in the 1950s, is alive and thriving on a cellular level and helping scientists find cures for cancer, Parkinson’s and other diseases, in laboratories across the world…

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

Produced and Presented by Marnie Chesterton

We test the science behind parasitic therapy to answer listener Michael’s question about whether intestinal worms can help us stay healthy, and visit a deworming programme in a rural Ugandan village.

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

Presenter: Marnie Chesterton Producer: Marijke Peters

(Picture: Tapeworm in human intestine, Credit: selvanegra/Getty Images)

Carbon dioxide levels in our atmosphere today are higher than at any point in human existence. But going back further into Earth’s history, when do we find concentrations as high as they are now - and what was the planet like back then?

CrowdScience sets out to answer our listener Thomas’s question, travelling back through time with the help of Antarctic ice cores, ancient plant fossils, and microscopic popcorn-shaped organisms called foraminifera, all of which hold clues to past climates.

Enlisting the help of chemists, botanists and palaeontologists, we find out about the huge swings in atmospheric carbon dioxide from prehistoric times to the present day, and ask the all-important question: can this help us understand what's happening to our climate now?

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

Presenter: Marnie Chesterton Producer: Cathy Edwards

(Image: Polar bear on an ice floe. Credit: Getty Images)

Philosopher Tom Chatfield’s media presence – which is substantial – is often directly linked to his writings on technology. But his new book is on critical thinking, and while that involves humanity’s oldest computer, the brain, Chatfield explains in this Social Science Bites podcast that new digital realities interact with old human biases.

As Chatfield tells interviewer Dave Edmonds, while he defines bias as “an inaccurate account of the way things actually are,” this like confirmation, affect and recency bias aren’t automatically toxic to critical thinking.

Basic problem is the use of heuristics, which are generally necessary and definitely useful (“sparing you the burden of endless research”), can paper over the need to leave our perceptions open to refutation and challenge. “Letting our emotional reaction double as truth, and be substituted for what we think of as truth,” is the problem, and not the mere existence of mental shortcuts.

That tolerance of heuristics is baked into his definition of critical thinking. “What I mean by critical thinking,” he explains, “is our attempts to be more reasonable about the world. And so this tends to involve coming up with reasoned arguments that support conclusions, reasoned explanations that seek to explain why things are the way they are, and perhaps most importantly, doing all this as part of a reasonable critically engaged discourse, where you’re listening to other people, you’re prepared to change your mind.”

Yes, he adds, critical thinking includes the traditional tentpoles of deductive and inductive reasoning, but also something else. “More and more we also need to roll into this the scientific and empirical method of seeking explanations, forming hypotheses, testing theories and – and this is the additional bit for me – building into all this our growing knowledge about human lives, the predictable biases in the way of thinking.”

Chatfield, a former visiting associate at the Oxford Internet Institute, is currently technology and media advisor at Agathos LLP; a faculty member at London’s School of Life; and a senior expert at the Global Governance Institute. He is a regular on the BBC online and broadcast, and has written six books since 2010 exploring digital culture such as Live This Book!, How to Thrive in the Digital Age and Netymology, with a seventh – Critical Thinking: Your Guide to Effective Argument, Successful Analysis and Independent Study– being published by SAGE this month. Chatfield also plays jazz piano and by his own admission “drinks too much coffee.”

Human Organs are in short supply. But what if you could grow new ones in the lab? And if you donate your body parts to help others, where might they end up? That's what Sarah Gray wanted to know after making the difficult decision to donate the body of her son, Thomas, to medical science after he died from an incurable disease shortly after being born. Sarah then contacted the scientists whose research has been made possible by Thomas’ donation and discovered just how he is contributing to research which, may one day mean that organ donation is no longer necessary.

Presenter Bobbie Lakhera talks to Sarah about her decision and meets some of the scientists working to create biological artificial lab-grown organs, tissues and even bones.

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

Presenter: Bobbie Lakhera Producer: Louisa Field

(Image: A doctor taking or delivering a bag containing a human organ for transplant. Credit: Getty Images)

Is it fair to kill invasive species which humans have introduced? When people move around the world, many of their favourite – and not so favourite - animals tag along for the ride. From cane toads through to rats, cats and crayfish, so-called ‘invasive species’ can destroy ecosystems and kill off native wildlife. CrowdScience listener Jude Kirkham wants to know if eradicating these invaders is justified.

One country determined to do something about invasive species is New Zealand, where rats, stoats and possums are causing irreparable damage to the country’s unique bird life. If nothing is done, the iconic Kiwi could be extinct within 50 years. The government and volunteer groups across the country have responded with a plan to eradicate predatory mammals from New Zealand by 2050. But is all the time, energy and money needed to do this really justified? And is it morally right to kill off an animal species that humans introduced in the first place?

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: Headshot of a Possum Credit: Getty Images)

Just one per cent of vehicles are powered by electricity, but CrowdScience listener Randall from Lac du Bonnet in Canada wants to know how quickly that might change, and whether one day all cars could be electric. Marnie Chesterton begins her journey in an electric car, stuck in traffic on a Los Angeles freeway.

It was in California where the modern electric car revival began in the late 1990s with the EV1 – popular with Hollywood celebrities like Mel Gibson and Danny DeVito. More than two decades on, several countries have pledged to go all-electric in future. The latest is China, who currently lead the world in the number of electric vehicles on the road. But is the planet’s power infrastructure even capable of supporting this global electric dream?

Marnie talks to experts about the practicalities of power supply and charging, takes a ride in an electric prototype with enough acceleration to impress even the most cynical petrol head and discovers an extraordinary vision for the future of personalised urban transport.

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

Presenter: Marnie Chesterton Producer: Jennifer Whyntie

(Image: Electric power cord plugged in and recharging the electric vehicle Credit: Getty Images)