Stephen Sackur speaks to the acclaimed Israeli historian and author Yuval Noah Harari. Having given us an explanation of the success of humankind in his book Sapiens, he’s now in darker territory. From Israel to the United States, he says democracy is in danger. Are humans losing the ability to trust and co-operate?

Stephen Sackur speaks to controversial philosopher Peter Boghossian, who spoofed a host of US academic journals to expose what he claims is the corruption of academia by politically fashionable ‘woke’ ideology. Is he stoking the fires of a dangerous culture war?

Philosopher Peter Singer has spent decades arguing for animal rights; his arguments have persuaded millions to give up meat. Has the movement he inspired become unstoppable?

Stephen Sackur speaks to American writer, academic and cultural commentator Roxane Gay. Her unflinching, extraordinary memoir Hunger deals with her experience of rape and obesity. How scary is the level of self-exposure in much of her writing? (Photo: Roxane Gay in the Hardtalk studio)

Stephen Sackur speaks to Ece Temelkuran, a prominent exiled Turkish writer and critic of President Erdogan. Erdogan has dominated Turkey for two decades but after the terrible earthquakes, with economic and political problems mounting and an election imminent, could his opponents finally bring him down? (Photo: Ece Tem

In a special edition from San Francisco, Stephen Sackur speaks to billionaire tech investor David Friedberg. He’s convinced science and technology can fix the world’s biggest challenges – climate, sustainable food, and energy production. But will we use our knowledge wisely?