Surgeon and writer Atul Gawande explores the nature of fallibility and suggests that preventing avoidable mistakes is a key challenge for the future of medicine.

Through the story of a life-threatening condition which affected his own baby son, Dr. Gawande suggests that the medical profession needs to understand how best to deploy the enormous arsenal of knowledge which it has acquired. And his challenge for global health is to address the inequalities in access to resources and expertise both within and between countries.

This first of four lectures was recorded before an audience at the John F Kennedy Presidential Library and Museum in Dr. Gawande's home town of Boston in Massachusetts. The other lectures are recorded in London, Edinburgh and Delhi.

The series is introduced and chaired by Sue Lawley. The producer is Jim Frank.

In the last of his four Reith Lectures, recorded in front of an audience at Central St Martins School of Art in London, the artist Grayson Perry discusses his life in the art world; the journey from the unconscious child playing with paint, to the award-winning successful artist of today. He talks about being an outsider and how he struggles with keeping his integrity as an artist. Perry looks back and asks why men and women throughout history, despite all the various privations they suffered, have always made art. And he discusses the central purpose of creating art - to heal psychic wounds and to make meaning.

In the third of four lectures, recorded in front of an audience at The Guildhall in Londonderry, the artist Grayson Perry asks if revolution is a defining idea in art, or has it met its end?

Perry says the world of art seems to be strongly associated with novelty. He argues that the mainstream media seems particularly drawn to the idea of there being an avant-garde: work is always described as being "cutting edge," artists are "radical," shows are "mould-breaking," ideas are "ground-breaking," "game-changing" or "revolutionary," We are forever being told that a new paradigm is being set.

Grayson Perry was awarded the Turner Prize in 2003 and is the first contemporary artist to deliver the Reith Lectures. He is best known for his ceramic works, print making, drawing, sculpture and tapestries as well as being a flamboyant cross-dresser.

The Reith Lectures are presented and chaired by Sue Lawley and produced by Jim Frank.

The award-winning artist Grayson Perry asks whether it is really true that anything can be art. We live in an age when many contemporary artists follow the example of Marcel Duchamp, who famously declared that a urinal was a work of art. It sometimes seems that anything qualifies, from a pile of sweets on a gallery floor to an Oscar-winning actress asleep in a box. How does the ordinary art lover decide?

In the first of four lectures, recorded in front of an audience at Tate Modern in London in 2013, the artist Grayson Perry reflects on the idea of quality and examines who and what defines what we see and value as art. He argues that there is no empirical way to judge quality in art. Instead the validation of quality rests in the hands of a tightknit group of people at the heart of the art world including curators, dealers, collectors and critics who decide in the end what ends up in galleries and museums. Often the last to have a say are the public.

The historian Niall Ferguson examines institutions outside the political, economic and legal realms, whose primary purpose is to preserve and transmit particular knowledge and values. In a lecture delivered at the Royal Society of Edinburgh, he asks if the modern state is quietly killing civil society in the Western world? And what can non-Western societies do to build a vibrant civil society?

Producer: Jane Beresford.

The historian Niall Ferguson delivers a lecture at Gresham College in the heart of legal London, addressing the relationship between the nature of law and economic success. He examines the rule of law in comparative terms, asking how far the common law's claims to superiority over other systems are credible. Are we living through a time of creeping legal degeneration in the English-speaking world?

Producer: Jane Beresford.

The eminent economic historian Niall Ferguson travels to the world's financial centre to deliver a lecture at the New-York Historical Society. He reflects on the causes of the global financial crisis, and argues that many people have drawn erroneous conclusions from it about the role of regulation. Is regulation, he asks, in fact "the disease of which it purports to be the cure"?

The eminent economic historian Professor Niall Ferguson argues that institutions determine the success or failure of nations. In a lecture delivered at the London School of Economics and Political Science, he says that a society governed by abstract, impersonal rules will become richer than one ruled by personal relationships. The rule of law is crucial to the creation of a modern economy and its early adoption is the reason why Western nations grew so powerful in the modern age.

But are the institutions of the West now degenerating? Professor Ferguson asks whether the democratic system has a fatal flaw at its heart. In the West young people are confronting the fact that they must live with the huge financial debt generated by their parents, something they had no control over despite the fact that they were born into a democracy. Is there a way of restoring the compact between different generations?

Producer: Jane Beresford.

In this third and final Reith lecture the former Director General of the security service (MI5), Eliza Manningham-Buller, discusses policy priorities since 9.11. She reflects on the Arab Spring, and argues that the West's support of authoritarian regimes did, to some extent, fuel the growth of Al-Qaeda. The lecture also considers when we should talk to "terrorists".