Imagine a world in which your laptop or mobile device accesses the internet, not via radio waves – or WiFi – as it does today but by using light instead: LiFi.

Well, that world may not be as far away as you might think. In fact, the technology is already here; and it’s thanks in large part to the engineering ingenuity of Harald Haas, Distinguished Professor of Mobile Communications and Director of the Li-Fi Research and Development Centre at the University of Strathclyde.

He tells Jim Al-Khalili about the two decades he has spent researching optical wireless communications, building up to his LiFi breakthrough in 2011, where he made waves in the scientific community and beyond by showing how a simple desk lamp could be used to stream a video.

Harald’s research could well have a very real impact on people’s lives, reinventing the way we connect online – but, as Jim hears, his early life was dogged by a very real fear he may have the same devastating disease that took his mother's life at an early age; an experience that shaped his early years and which has driven him to succeed in his own life and career.

Produced by Gerry Holt.

Our genes can tell us so much about us, from why we look the way we look, think the way we think, even what kind of diseases we might be likely to suffer from. But our genes aren't the whole story. There are other, complex and intriguing systems within every cell in our bodies which control which of our tens-of-thousands of genes are switched on, or off, in different parts of the body, and under different circumstances.

Welcome to the fascinating world of 'epigenetics', which our guest, the molecular geneticist Anne Ferguson-Smith, describes as 'genetics with knobs on'.

Anne, now Arthur Balfour Professor of Genetics and Pro-Vice Chancellor for Research at the University of Cambridge, tells Jim about her life and work. She's spent her professional life at the cutting edge: from a degree in a brand new field of Molecular Biology, to post-grad working on brand new genetic structures, through to a lifetime of discoveries and breakthroughs which have changed our understanding of the genome.

Yet she wasn't always destined to be a scientist. She says she was a 'bad student' for a lot of her early life, and believes that embracing failure is an essential part of being a working scientist.

Produced by Emily Knight

Anne-Marie Imafidon passed her computing A-Level at the age of 11 and by 16, was accepted to the University of Oxford to study Maths and Computer Science.

She's used to the 'child prodigy' label that's followed her throughout her career, but that doesn't mean she's had an easy ride.

It was a combination of personal experience and the discovery that the number of women working in the STEM sectors - Science, Technology, Engineering and Mathematics - was in free-fall that inspired Anne-Marie to found Stemettes: a not-for-profit social enterprise introducing girls to STEM ideas and careers in fun and accessible ways. It's now in its tenth year and still growing, while Anne-Marie has received an MBE, enjoyed a successful stint as the numbers guru on the TV series Countdown, and is the current President of the British Science Association.

In conversation in front of an audience at the 2023 Cheltenham Science Festival, she tells Jim Al-Khalili about her quest for equality and diversity across the scientific community - and explains why she thinks everyone has the potential to be a 'child prodigy', given the right opportunity...

Produced by Lucy Taylor.

From landslides and wildfires to floods and tornadoes, Bruce Malamud has spent his career travelling the world and studying natural hazards.

Today, he is Wilson Chair of Hazard and Risk and Executive Director of the Institute of Hazard, Risk and Resilience at Durham University - but as he tells Jim Al-Khalili, a lifelong passion for discovery has taken Bruce from volunteering with the Peace Corps in West Africa and a Fulbright Fellowship in Argentina, to fieldwork in India; not only studying hazards themselves, but also the people they affect - and building up the character and resilience to overcome personal tragedy along the way...

Over the years, his work in the field has opened up new ways of understanding such events: from statistical modelling to show how groups of hazards occur, to examining the cascading relationships between multiple hazards. And today, his focus is on projects that can bring tangible benefits to people at serious risk from environmental hazards - finding innovative ways to help them to better manage that threat.

Produced by Lucy Taylor.

How often do you think about chemistry?

The chances are, not often - but it is vital to every part of our lives, from the air we breathe, to the processes that take place inside our bodies and the materials we use.

Gillian Reid is Professor of Inorganic Chemistry at the University of Southampton and she is on a mission to make sure we all know what chemistry can do for us - and how it is tackling some of society’s biggest challenges.

Hers is a story of firsts - the first in her immediate family to go to university and the first female member of staff in the chemistry department at the University of Southampton, where she later became the first female Professor and Head of Department. She is also the reigning President of the Royal Society of Chemistry - one of very few women to have taken on that mantle in its 182-year history.

She tells Jim Al-Khalili about life as a female professor in a male-dominated space - and what needs to change to unlock chemistry for everyone. He also hears how Gillian is discovering new compounds that could revolutionise tech and medicine.

We’ll also hear why she thinks research isn’t actually that hard and how chemistry can be a little bit like Lego… Do join us.

Produced by Gerry Holt

The world around us is three-dimensional. Yet, there are materials that can be regarded as two-dimensional. They are only one layer of atoms thick and have remarkable properties that are different from their three-dimensional counterparts.

There are almost a million people in the UK living with dementia, and Alzheimer’s is the most common form. But the disease actually starts long before any noticeable symptoms appear, and over the past decade, studies have shown that it is much more complex than previously thought.

Julie Williams has been at the forefront of this effort, uncovering the genes that make us susceptible, and has transformed our understanding of this devastating disease. She has brought researchers together to create bigger datasets and more powerful studies. Her current work with scientists from other fields, like immunology and computational biology, is looking at the mechanisms underlying Alzheimer’s disease.

Julie tells Jim about her early interest in science, her time as Chief Scientific Advisor to the Welsh government, and her belief in ‘team science’ – collaborating and sharing research findings across international borders and disciplines.

Produced by Florian Bohr

Since 1900, our best estimates suggest that earthquakes have caused around 2.3 million deaths worldwide; we saw the devastating effects of one just recently, in Turkey and Syria. And as scientists have been at pains to point out over the years, there is no reliable short-term warning system.

But thanks to the work of people like James Jackson, an Emeritus Professor of Active Tectonics at the University of Cambridge, we are finding new ways of understanding and withstanding seismic activity.

James tells Jim Al-Khalili about his career travelling the world in search of quake sites and fault lines – trialling new technology and techniques in a quest to understand the processes that shake and shape our planet’s surface; and working out how this information can help vulnerable cities become more resilient to quakes in future...

Produced by Lucy Taylor.

Marie Johnston is a pioneer in the field of health psychology: the discipline that seeks to understand how psychological, behavioural and cultural factors contribute to our physical and mental health.

Produced by Lucy Taylor.

Professor Dame Julia King, Baroness Brown of Cambridge, is an engineer whose fascination with metals, and skill for handling both research projects and people, has taken her from academia to industry to the House of Lords.

She tells Jim Al-Khalili how the dressmaking skills she learnt from her mother as a child helped her to understand the composite structures used in wind turbines later in life. And how she designed metal alloys that are resistant to both large and small cracks.

As the author of the UK government's Review of Low Carbon Cars in 2007, Julia set out a route to decarbonising a major segment of the transport sector within 25 years, making an important contribution to the UK's plans to try and achieve Net Zero.

But achieving Net Zero is not enough. With demand for electricity set to double or treble by 2050, there’s an urgent need to radically reform our national infrastructure and guarantee supply.

Julia became a cross-bench member of the House of Lords in 2015. She’s now chair of its Science and Technology Committee, holding the government to account on its promise to make the UK a science superpower.