Samira Ahmed talks with Lee Smolin, a controversial and prominent figure in the field of theoretical physics, about the search for a new kind of theory that can be applied to the whole universe challenging the way we experience time. Is Italy a Mafia republic? Acclaimed Mafia historian John Dickie, political journalist Annalisa Piras and author Clare Longrigg discuss. Samuel Beckett's 'Not I' premiered 40 years ago. To mark the anniversary the Royal Court theatre is staging the piece again, performed by Lisa Dwan. Lisa and Derval Tubridy, join Samira. Challenges to our concept of the physical world abound with recent news in technological advances. Philosopher Julian Baggini reflects on conceiving the inconceivable.