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The Italian physicist Carlo Rovelli delves into the meaning of time. He tells Andrew Marr how we live in a timeless world but have evolved to perceive time's flow.The astrophysicist Carole Mundell is interested in the extragalactic. Her studies of the universe beyond our Milky Way help expand knowledge of cosmic black holes and explain powerful explosions in space.Space travel is the new frontier, but exactly 250 years ago the Endeavour set sail from Plymouth seeking to test the limits of scientific understanding. An exhibition at the British Library, curated by Laura Walker, tells the story of Captain Cook's world-changing voyages and their studies into the skies, seas and lands beyond our shores.And the marine biologist Helen Scales is more interested in exploring the world beneath the oceans. Her latest book marvels at the wonders of fish, from centuries-old giants to tiny restless travellers moving in shoals across our globe.Producer: Katy Hickman.

Tom Sutcliffe discusses free will and fate; dreams and reality. Jesmyn Ward's prize-winning novel Sing, Unburied, Sing, set in the American South, is haunted by the ghosts of the past. Ward writes of incarceration and freedom, and the strength - and weakness - of family bonds.For his latest ballet, choreographer Kim Brandstrup has taken inspiration from Calderon's 17th century Spanish play Life is a Dream, in which a dire prophecy leads a King to imprison his son. Brandstrup uses contemporary dance to explore where dreams end and reality begins, but also to express wonder at life itself.How to live well is at the centre of Edith Hall's self-help book based on the teachings of Aristotle. She examines the ancient Greek philosopher's ideas on how self-knowledge, responsibility and love could help us forge a more meaningful life. And the philosopher John Gray continues his exploration of what it is to be human in his new work, Seven Types of Atheism.Producer: Katy Hickman.

Fifty years after radicals took to the streets of Paris and stormed campuses across the Western World, Andrew Marr unpicks the legacy of 1968.Historian Richard Vinen finds waves of protest across the western world in his book The Long '68: Radical Protest and Its Enemies. Some movements were genuinely revolutionary, such as the ten million French workers whose strike nearly toppled the government. But on American university campuses and in British art schools, protests took the forms of civil rights marches and feminist collectives, whose narratives changed the way we think today.In Paris, left-wing students armed with works of philosophy took on the police and the state. But Paris was still coming to terms with its Nazi occupation, explains Agnès Poirier. Her new book follows the artists and writers of the 40s and 50s, from Simone de Beauvoir and Jean-Paul Sartre to Miles Davis and James Baldwin, as a new generation helped France regain its reputation for art, passion and political action.Not only left-wing radicals were inspired by the events of that year. In 1968 philosopher Roger Scruton was holed up in a Paris bedroom studying while rioters smashed windows outside. Scruton was horrified by the chaos and destruction, and turned his back on the left-wing politics of his childhood. He became part of a generation of new conservatives who sought to preserve the past rather than fight for an unknown future.Today France is facing new waves of strikes, with railway workers bringing the transport system to a halt and Emmanuel Macron pushing through sweeping reforms to social security. Sophie Pedder, Paris bureau chief for The Economist and author or a new biography of Macron, asks what France in 2018 owes to the events of 1968.Producer: Hannah Sander.