Far from being exhausted, classical scholar Mary Beard explains why the subject of ancient Rome continues to surprise and resonate.

What is great design?

Big Ideas explores the similarities of mateship with the camaraderie of the seedy underworld.

Stephen Hawking explains how black holes challenge the very nature of space and time.

Does free will exist? It’s an important debate with huge implications: If we are free to make our own decisions, we are accountable for what we do. If we aren't, we're off the hook.

Magda Szubanski has been making us laugh for years, but she is also an intelligent and serious woman.

Leading contemporary artist Ai Weiwei in conversation with Virginia Trioli at the launch of the National Gallery of Victoria's major exhibition Andy Warhol - Ai Weiwei

The work of Sigmund Freud has shaped discussion and social discourse since the start of the 20th century. Why are his concepts so influential?

Noel Pearson and philosopher Jonathan Lear discuss recognition, radical hope and reconciliation.

Historian, Margaret MacMillan, discusses the observers of history and the contribution they made.