In Our Time: Science

Latest Episodes:

Free Radicals Nov 01, 2018

Show notes

Melvyn Bragg and guests discuss the properties of atoms or molecules with a single unpaired electron, which tend to be more reactive, keen to seize an electron to make it a pair. In the atmosphere, they are linked to reactions such as rusting. Free radicals came to prominence in the 1950s with the discovery that radiation poisoning operates through free radicals, as it splits water molecules and produces a very reactive hydroxyl radical which damages DNA and other molecules in the cell. There is also an argument that free radicals are a byproduct of normal respiration and over time they cause an accumulation of damage that is effectively the process of ageing. For all their negative associations, free radicals play an important role in signalling and are also linked with driving cell division, both cancer and normal cell division, even if they tend to become damaging when there are too many of them.

With

Nick Lane Professor of Evolutionary Biochemistry at University College London

Anna Croft Associate Professor at the Department of Chemical and Environmental Engineering at the University of Nottingham

And

Mike Murphy Professor of Mitochondrial Redox Biology at Cambridge University

Producer: Simon Tillotson

Automata Sep 20, 2018

Show notes

Melvyn Bragg and guests discuss the history of real and imagined machines that appear to be living, and the questions they raise about life and creation. Even in myth they are made by humans, not born. The classical Greeks built some and designed others, but the knowledge of how to make automata and the principles behind them was lost in the Latin Christian West, remaining in the Greek-speaking and Arabic-speaking world. Western travellers to those regions struggled to explain what they saw, attributing magical powers. The advance of clockwork raised further questions about what was distinctly human, prompting Hobbes to argue that humans were sophisticated machines, an argument explored in the Enlightenment and beyond.

The image above is Jacques de Vaucanson's mechanical duck (1739), which picked up grain, digested and expelled it. If it looks like a duck...

with

Simon Schaffer Professor of History of Science at Cambridge University

Elly Truitt Associate Professor of Medieval History at Bryn Mawr College

And

Franziska Kohlt Doctoral Researcher in English Literature and the History of Science at the University of Oxford

Producer: Simon Tillotson

Echolocation Jun 21, 2018

Show notes

Melvyn Bragg and guests discuss how some bats, dolphins and other animals emit sounds at high frequencies to explore their environments, rather than sight. This was such an unlikely possibility, to natural historians from C18th onwards, that discoveries were met with disbelief even into the C20th; it was assumed that bats found their way in the dark by touch. Not all bats use echolocation, but those that do have a range of frequencies for different purposes and techniques for preventing themselves becoming deafened by their own sounds. Some prey have evolved ways of detecting when bats are emitting high frequencies in their direction, and some fish have adapted to detect the sounds dolphins use to find them.

With

Kate Jones Professor of Ecology and Biodiversity at University College London

Gareth Jones Professor of Biological Sciences at the University of Bristol

And

Dean Waters Lecturer in the Environment Department at the University of York

Producer: Simon Tillotson.

The Proton Apr 26, 2018

Show notes

Melvyn Bragg and guests discuss the discovery and growing understanding of the Proton, formed from three quarks close to the Big Bang and found in the nuclei of all elements. The positive charges they emit means they attract the fundamental particles of negatively charged electrons, an attraction that leads to the creation of atoms which in turn leads to chemistry, biology and life itself. The Sun (in common with other stars) is a fusion engine that turn protons by a series of processes into helium, emitting energy in the process, with about half of the Sun's protons captured so far. Hydrogen atoms, stripped of electrons, are single protons which can be accelerated to smash other nuclei and have applications in proton therapy. Many questions remain, such as why are electrical charges for protons and electrons so perfectly balanced?

With

Frank Close Professor Emeritus of Physics at the University of Oxford

Helen Heath Reader in Physics at the University of Bristol

And

Simon Jolly Lecturer in High Energy Physics at University College London

Producer: Simon Tillotson.

George and Robert Stephenson Apr 12, 2018

Show notes

In a programme first broadcast on April 12th 2018, Melvyn Bragg and guests discuss the contribution of George Stephenson (1781-1848) and his son Robert (1803-59) to the development of the railways in C19th. George became known as The Father of Railways and yet arguably Robert's contribution was even greater, with his engineering work going far beyond their collaboration.

Robert is credited with the main role in the design of their locomotives. George had worked on stationary colliery steam engines and, with Robert, developed the moving steam engine Locomotion No1 for the Stockton and Darlington Railway in 1825. They produced the Rocket for the Rainhill Trials on the Liverpool and Manchester Railway in 1829. From there, the success of their designs and engineering led to the expansion of railways across Britain and around the world.

with

Dr Michael Bailey Railway historian and editor of the most recent biography of Robert Stephenson

Julia Elton Past President of the Newcomen Society for the History of Engineering and Technology

and

Colin Divall Professor Emeritus of Railway Studies at the University of York

Producer: Simon Tillotson. This programme is a repeat

Rosalind Franklin Feb 22, 2018

Show notes

Melvyn Bragg and guests discuss the pioneering scientist Rosalind Franklin (1920 - 1958). During her distinguished career, Franklin carried out ground-breaking research into coal and viruses but she is perhaps best remembered for her investigations in the field of DNA. In 1952 her research generated a famous image that became known as Photograph 51. When the Cambridge scientists Francis Crick and James Watson saw this image, it enabled them the following year to work out that DNA has a double-helix structure, one of the most important discoveries of modern science. Watson, Crick and Franklin's colleague Maurice Wilkins received a Nobel Prize in 1962 for this achievement but Franklin did not and today many people believe that Franklin has not received enough recognition for her work.

With:

Patricia Fara President of the British Society for the History of Science

Jim Naismith Interim lead of the Rosalind Franklin Institute, Director of the Research Complex at Harwell and Professor at the University of Oxford

Judith Howard Professor of Chemistry at Durham University

Producer: Victoria Brignell.

Fungi Feb 15, 2018

Show notes

Melvyn Bragg and guests discuss fungi. These organisms are not plants or animals but a kingdom of their own. Millions of species of fungi live on the Earth and they play a crucial role in ecosystems, enabling plants to obtain nutrients and causing material to decay. Without fungi, life as we know it simply would not exist. They are also a significant part of our daily life, making possible the production of bread, wine and certain antibiotics. Although fungi brought about the colonisation of the planet by plants about 450 million years ago, some species can kill humans and devastate trees.

With:

Lynne Boddy Professor of Fungal Ecology at Cardiff University

Sarah Gurr Professor of Food Security in the Biosciences Department at the University of Exeter

David Johnson N8 Chair in Microbial Ecology at the University of Manchester

Producer: Victoria Brignell.

Cephalopods Feb 01, 2018

Show notes

The octopus, the squid, the nautilus and the cuttlefish are some of the most extraordinary creatures on this planet, intelligent and yet apparently unlike other life forms. They are cephalopods and are part of the mollusc family like snails and clams, and they have some characteristics in common with those. What sets them apart is the way members of their group can change colour, camouflage themselves, recognise people, solve problems, squirt ink, power themselves with jet propulsion and survive both on land, briefly, and in the deepest, coldest oceans. And, without bones or shells, they grow so rapidly they can outstrip their rivals when habitats change, making them the great survivors and adaptors of the animal world.

With

Louise Allcock Lecturer in Zoology at the National University of Ireland, Galway

Paul Rodhouse Emeritus Fellow of the British Antarctic Survey

and

Jonathan Ablett Senior Curator of Molluscs at the Natural History Museum

Producer: Simon Tillotson.

Carl Friedrich Gauss Nov 30, 2017

Show notes

In a programme first broadcast in 2017, Melvyn Bragg and guests discuss Gauss (1777-1855), widely viewed as one of the greatest mathematicians of all time. He was a child prodigy, correcting his father's accounts before he was 3, dumbfounding his teachers with the speed of his mental arithmetic, and gaining a wealthy patron who supported his education. He wrote on number theory when he was 21, with his Disquisitiones Arithmeticae, which has influenced developments since. Among his achievements, he was the first to work out how to make a 17-sided polygon, he predicted the orbit of the minor planet Ceres, rediscovering it, he found a way of sending signals along a wire, using electromagnetism, the first electromagnetic telegraph, and he advanced the understanding of parallel lines on curved surfaces.

With

Marcus du Sautoy Professor of Mathematics and Simonyi Professor for the Public Understanding of Science at the University of Oxford

Colva Roney-Dougal Reader in Pure Mathematics at the University of St Andrews

And

Nick Evans Professor of Theoretical Physics at the University of Southampton

Producer: Simon Tillotson.

Feathered Dinosaurs Oct 26, 2017

Show notes

After 27 years, Melvyn Bragg has decided to step down from the In Our Time presenter’s chair. With over a thousand episodes to choose from, he has selected just six that capture the huge range and depth of the subjects he and his experts have tackled. In this sixth of his choices, we hear Melvyn Bragg and his guests in 2017 discussing new discoveries about dinosaurs.

Their topic is the development of theories about dinosaur feathers, following discoveries of fossils which show evidence of those feathers. All dinosaurs were originally thought to be related to lizards (the word 'dinosaur' was created from the Greek for 'terrible lizard') but that now appears false. In the last century, discoveries of fossils with feathers established that at least some dinosaurs were feathered and that some of those survived the great extinctions and evolved into the birds we see today. There are still many outstanding areas for study, such as what sorts of feathers they were, where on the body they were found, what their purpose was and which dinosaurs had them.

With

Mike Benton Professor of Vertebrate Palaeontology at the University of Bristol

Steve Brusatte Reader and Chancellor's Fellow in Vertebrate Palaeontology at the University of Edinburgh

and

Maria McNamara Senior Lecturer in Geology at University College, Cork

Producer: Simon Tillotson

Spanning history, religion, culture, science and philosophy, In Our Time from BBC Radio 4 is essential listening for the intellectually curious. In each episode, host Melvyn Bragg and expert guests explore the characters, events and discoveries that have shaped our world

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