Instant Genius BBC Science Focus

Whether they’re triggered by looking through old family photographs, hearing a piece of music you haven’t heard for years or eating a favourite childhood snack, feelings of nostalgia often come flooding into our hearts and minds.

But what is going on in our brains when we have these feelings?

In this episode I catch up with writer and historian Dr Agnes Arnold-Forster a writer, author of the new book Nostalgia: A History of a Dangerous Emotion.

She tells us how this intriguing emotion has gone from being thought of as a deadly disease to being used as a therapy to treat degenerative cognitive conditions.
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We all forget things from time to time, it’s a normal part of everyday life. But according to the latest research in neuroscience, it is forgetting, not remembering that is the brain’s default action.

So why is this?

In this episode I speak to Prof Charan Ranganath, director of the Dynamic Memory Lab at UC Davis and author of the book Why We Remember: The Science of Memory and How it Shapes Us.

He tells us how memories form in our brains, how they are intimately linked to our emotions and imagination, and why we often walk into another room and forget why we went there in the first place.
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When it comes to thinking about sustainability, most of us usually keep our feet on the ground. But as we extend our reach beyond this small rocky planet and out into the solar system, is it time to think about how we use space sustainably too?
 
Our guest today is Aaron Boley, Associate Professor of astronomy and astrophysics at The University of British Columbia and co-author of Who Owns Space?: International Law, Astrophysics and the Sustainable development of space.
 
With hundreds of thousands of satellites planned for launch in the next few years, Aaron is warning that our orbital space is getting too crowded and could be heading for a dangerous point of no return.
 
Is there still time for us to learn from our mistakes down at ground level and build a sustainable future among the stars?
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There is little doubt that the advent of the computer has had one of the most far-reaching impacts of any invention in the history of mankind. These days, it’s difficult for most of us to imagine life without them. But building ever faster processors is becoming something of a challenge.

The solution to this could be quantum computers – machines so powerful they can tackle problems that would take even the biggest supercomputers we have today billions of years to solve.

In this episode I speak to Prof Winfried Hensinger, director of the Sussex Centre for Quantum Technologies.

We talk about his work on creating the world’s first large-scale quantum computer, how it works, and how quantum computers could help scientists do everything from breaking complex forms of encryption to creating innovative new medicines.
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We often hear about the importance of our immune system, but how can we maintain it and keep it healthy? The answer is easier than you might think. We spoke to Bobby Cherayil, the author of the new book The Logic Of Immunity, deciphering an enigma to learn more about the importance of a healthy immune system.
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Be it drank first thing in the morning, as an afternoon pick-me-up or to soothe our souls after hearing some bad news, we Brits love a cup of tea.

But over recent years, the traditional cup of black builders’ tea has found a new rival vying for our attention in cafés and on supermarket shelves – its more traditional cousin green tea.

Many people are making the change not for reasons of flavour but for its supposed health benefits. But is there any truth in this?

In this episode I speak to Justin Roberts, a professor of nutritional physiology based at Anglia Ruskin University in Cambridge.

He tells us all about the nutritional content and potential health benefits we can gain from drinking this ancient beverage.
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