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Why do some people get involved while others stand by looking on? What makes people act for the sake of others? Kirsty Wark discusses the psychology of behaviour with Catherine Sanderson and David Halpern.In the Bystander Effect, Catherine Sanderson argues that the question of why some people act badly while others are heroic is not simply about good and bad. Our brains are hard-wired to conform and to avoid social embarrassment. But there are practical measures that can help create a sense of personal responsibility, turning a silent bystander into a model of action. The psychologist David Halpern is also interested in how to change behaviour. He is advising the UK Government on its response to the coronavirus pandemic, focusing on how to get the public to adopt new social norms, including increased hand-washing and social distancing. Halpern is the Chief Executive of the Behavioural Insights Team, unofficially known as The Nudge Unit. Producer: Katy Hickman

A year ago French people looked on with horror as the great Notre-Dame went up in flames. The journalist Agnès Poirier tells Andrew Marr that the cathedral with its 800 year history represents the soul of the nation. Even before the fire was out President Macron was promising that it would be rebuilt. But in Notre-Dame: The Soul of France, Poirier recounts how its current reconstruction has been mired in controversy – political, social, artistic and religious. Poirier also looks at how the French government and people have reacted to the coronavirus pandemic.In Hungary, Viktor Orban’s government has been voted sweeping new powers to rule by decree for an indefinite period, to deal with the coronavirus crisis. The academic Martyn Rady is keeping a keen eye on how different countries in Central Europe respond. He argues that the region has been shaped by the formidable power and influence of the Habsburg dynasty. In his latest book, The Habsburgs: The Rise and Fall of a World Power, Rady shows how from modest origins in the 9th century the family soon gained control of the Holy Roman Empire, stretching from Spain to Hungary and beyond. Producer: Katy Hickman

On Easter Monday, Andrew Marr talks to the psychiatrist and keen gardener Sue Stuart-Smith on our love for nature. In The Well-Gardened Mind: Rediscovering Nature in the Modern World, she blends neuroscience, psychoanalysis and real-life stories. She reveals the remarkable effects that gardens and the great outdoors can have on us.William Wordsworth was the great poet of the British countryside, celebrated for his descriptions of daffodils and the passing of the river above Tintern Abbey. But in a new biography, Radical Wordsworth: The Poet Who Changed the World, Sir Jonathan Bate shows how Wordsworth also made nature something challenging and even terrifying. The poet drew on shocking revolutionary ideas from the continent, including pantheistic atheism: the worship of nature.Producer: Hannah Sander