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Andrew Marr with the physicists Brian Greene and Brian Cox explores the universe in all its wonder. And he attempts to understand our relation to parallel universes, which can be separated from us by enormous stretches of time and space, or hover just millimetres away. The science writer, Angela Saini, looks at why India is so successful in producing the next generation of doctors and scientists, in her book, Geek Nation. Producer: Katy Hickman.

Andrew Marr talks to the human rights lawyer, Peter Harris, who represented the ANC when apartheid in South Africa was at its height. He discusses how the law was always seen to be done, even when justice was denied. Richard Susskind wants to revolutionise the justice system: as the new President of the Society for Computers and Law he sees technology as the answer to today's problems. Australia has been the recent victim of natural disasters - floods, storms and wild fires - and the country's leading conservationist, Tim Flannery, puts forward his views on the future of the planet. And as the longest running study of elephants in the wild turns 40, Phyllis Lee, explains what they've learnt about, what John Donne called, "Nature's great masterpiece". Producer: Katy Hickman.

Andrew Marr with the former UN deputy secretary-general Mark Malloch-Brown, who argues that national governments are no longer equipped to address complex international issues. The Conservative MP Daniel Kawczynski describes the "corrupt grandiosity" of the Libyan leader Colonel Gaddafi, and explains what is meant by the government's 'principled engagement' with the country. The historian David Gilmour looks back a hundred and fifty years to the unification of Italy, and considers whether it has ever really become a coherent nation-state. And the human rights lawyer, Baroness Helena Kennedy, believes we need to be more judgemental if we are to live an ethical life.Producer: Katy Hickman.