Author: BBC Radio 4

The astrophysicist Professor Lisa Kaltenegger is like an explorer of old, but her voyage takes her far from earth, planet hunting across the universe. She is Director of the Carl Sagan Institute to Search for Life in the Cosmos at Cornell University, and in her new book Alien Earths she describes the very latest discoveries of exoplanets which are the best contenders for harbouring alien life.

Claudia de Rham is Professor of Theoretical Physics at Imperial College London and in her book The Beauty of Falling she tells the story of gravity. From her personal experience of diving in the ocean and freefalling over the earth, to exploring the limits of Einstein’s general theory of relativity she seeks to understand both the feeling and the fundamental nature of gravity.

If only all of physics could be so compelling! Professor Mark Fromhold is Head of Physics at Nottingham University and is campaigning for a change to the way pupils are taught, suggesting that quantum physics be incorporated into the curriculum. He argues that at present the subject is too earth-bound, and ‘dull as dishwater’.

Producer: Katy Hickman

London, and the river that runs through it, is at the heart of the new play London Tide, an adaptation of Charles Dickens’ Our Mutual Friend. Ben Power has adapted the novel and co-written original songs with the singer-songwriter PJ Harvey. He tells Adam Rutherford that although it combines the savage satire and social analysis of the original, it is, in essence, a love letter to the capital. London Tide is playing at the National Theatre until 22nd June.

The award-winning architect Amanda Levete reflects on the challenges of designing buildings and public spaces in major historic cities around the world – taking into consideration the aesthetics of the built environment, whilst meeting the needs of the community and tackling sustainability.

Amanda Levete considers the Pompidou Centre in Paris to be one of the twentieth century’s most iconic buildings and an inspiration for her own architectural practice. The journalist Simon Kuper takes stock of his adopted city, as Paris prepares for the Olympics. In Impossible City he explores today’s ‘Grand Paris’ project which aims to connect its much famed central areas with its neglected suburbs.

Producer: Katy Hickman

2024 has been dubbed the year of elections, as at least 64 countries – including the UK – are heading for the polls. Tom Sutcliffe and guests explore the state of democracy.

The political philosopher Erica Benner reflects on the tensions in liberal democracy in her book, Adventures in Democracy: The Turbulent World of People Power. From her childhood in post-war Japan, to working in post-communist Poland, and with forays into ancient Greece and Renaissance Erica Benner looks at the role of ordinary citizens in keeping democracy alive.

Democracy in India has a long history with roots in ancient councils of elders, although its modern manifestation began with independence from British rule in 1947. But the anthropologist Alpa Shah raises questions about how far democratic institutions are failing in India, as minority groups - the Dalits, Adivasis and Muslims - are targeted and demonised, in her new book The Incarcerations.

The UK will have a general election this year, and although satisfaction with politics ranks very low in relation to other countries, faith in democracy continues to rise. The research is by the Policy Institute at King’s College London, and its director Bobby Duffy says that while there’s little support for authoritarian forms of government, the idea of Citizen Assemblies are becoming more popular.

Producer: Katy Hickman

Humankind’s relationship with music can be traced back millions of years and across continents. In Sound Tracks the archaeologist Graeme Lawson unearths some of the oldest instruments, from water-filled pots in Peru from AD700 that chirp like a bird, to bells from a tomb in 5th century China. He argues that music is part of what makes us human.

An ancient horn, played from a watchtower on Hadrian's Wall, is a far cry from the modern version the award-winning trumpeter Alison Balsom plays. She is giving the UK premiere of Wynton Marsalis’ Trumpet Concerto with the London Symphony Orchestra (Barbican on the 11th April; Bristol Beacon on the 12th). This is a contemporary piece that showcases the huge versatility of the trumpet, from the opening pre-historic-sounding wild elephant call to ceremonial fanfare and New Orleans jazz.

The celebrated poet John Burnside’s new collection, Ruin, Blossom explores what it is to be human as we contemplate our mortality. But even amidst the ruin and death and decay, his words reveal the beauty and hope in the everyday natural world: ‘first sun streaming through the trees … a skylark in the near field, flush with song’.

(Extract from Wynton Marsalis’ Trumpet Concerto, played by Alison Balsom with the Swedish Radio Orchestra in a concert from 17th February 2024, with permission from the Swedish Radio Orchestra )

Producer: Katy Hickman