Trust in government is at an all-time low in many countries. From failed healthcare policies to missed intelligence, government blunders happen often – and visibly. But successful policy-making is hard (and fixes are rarely as quick as politicians like to promise). Some argue that governments would do stupid things less often if they based their policies on the careful analysis of good evidence; find out what works, in other words, and then do that. But that’s not how most governments operate, most of the time. Why not? Presenter: Michael Blastland(Photo: a group of journalists being surrounded by the Media. Credit Shutterstock)

Hillary Clinton lost the US election despite some polls putting her chances of winning at 99%.In the run up to the vote pollsters spent huge sums of money speaking to thousands of Americans. They were careful to collect the best possible data from representative samples, and they applied their finest statistical minds to analysing the numbers. Yet almost no-one predicted that Donald Trump would win. So – our question this week – why did the polls get it so wrong? Our expert witnesses explain why polling is getting harder, and why many pollsters weren’t – despite that – very far wide of the mark.(Photo: Hillary Clinton and Donald Trump listen during the town hall debate at Washington University in St Louis, Missouri, October 2016. Credit: Getty Images)

Smoking tobacco is the single most dangerous voluntary activity in the world. It kills six million people a year, and if current trends continue that figure is expected to rise to 8 million people by 2030. Even if it does not kill you, it will give you bad breath, bad skin and cost you money. So why do so many of us still smoke?(Photo: A man holds a cigarette over an ashtray. Credit: Patrik Stollarz/AFP/Getty Images)

On 8 November, as they stood in line to cast their votes, Americans were told by pollsters and pundits that, while close, the presidential race would be won by Hillary Clinton. As the results came in, precinct by precinct, many in the political establishment watched the unfolding story in disbelief. It was a similar feeling to that felt by many in Britain’s so-called ‘chattering class’ when, on June 24, they woke to the news that the UK had voted to leave the EU. Both were seismic political shocks. Neither was predicted by pollsters. What next? After two extraordinary electoral shocks, both of which challenge the established order, and with elections coming up in France and Germany, should we expect more? (Photo: Republican Presidential nominee Donald Trump (R) greets UK Independence Party leader Nigel Farage at a campaign rally, Mississippi Coliseum. Credit: Jonathan Bachman/Getty Images)

The Clinton–Trump race has been extraordinary. Two of the most unpopular presidential candidates ever have slugged it out through a bitter campaign. They are both – for different reasons – deeply polarising figures. Hillary Clinton is viewed with suspicion by Americans who have turned against what they regard as “the elite”. Donald Trump has exploited crudely divisive, sexist, even racist, rhetoric. The tone of the contest has been ugly. But there is historical precedent for much of this – divisive policy positions on slavery or the famous attack ads of the 1960s. How should we view this campaign compared to the candidates, rhetoric, policies and media climate of past elections?(Photo: Republican presidential candidate Donald Trump listens behind Democratic nominee Hillary Clinton as she answers a question i their presidential town hall debate at Washington University in St Louis, Missouri. Credit: Rick Wilking)

By 2050, experts predict that drug-resistant infections will kill one person every three seconds unless the world’s governments take drastic steps now. But given the complexity of antibiotics resistance, what should their plan be? Some of the possible fixes involve changing ingrained human behaviours such as doctors’ prescribing habits and the intensive farming of animals. But other promising solutions to avert a post-antibiotics apocalypse come from surprising sources. Scientists are now hunting for undiscovered fungi in the world’s most remote places while other researchers stay in the lab deciphering the language of bacteria. (Photo: A depiction of some EHEC bacteria Credit: HZI/Getty Images)

The International Monetary Fund says corruption siphons $2 trillion a year out of the global economy, slowing growth and fuelling poverty. Endemic corruption is very hard to deal with. But not impossible. We tell the astonishing story of one country – Georgia – which did turn itself around. At the turn of the century Georgia was one of the most corrupt states in the world. Now it is one of the cleanest. How did it do it?(Photo: Two men in suits shake hands while one puts money into the pocket of the other. Credit: Shutterstock)

Earlier this year Europol, the EU's law enforcement agency, announced 10,000 children had arrived in Europe, part of the wave of migration that has swept through the continent in recent years. They had been registered and identified. And then they had disappeared. Many of these children are travelling alone. Some are as young as six years old. But the authorities across Europe – the police, the border agencies, NGOs and care organisations – have no idea where they have gone. They are at risk from trafficking and exploitation as well as the hazards of the journey across Europe – jumping onto lorries at Calais, sleeping rough in Northern European weather. Under international and EU law children should be protected. There are various systems and regulations in place to deal with unaccompanied child migrants, whether refugees or not. But the system is failing and children continue to go missing at an alarming rate. Why? (Photo: A young boy walks past the Jungle Books Cafe in the Jungle migrant camp Credit: Christopher Furlong/Getty Images)

So-called Islamic State is on the run. Caught in a pincer movement in Syria and Iraq, the group has lost large swathes of territory over the past year. With its revenues and numbers of fighters also dwindling, the demise of the caliphate appears all but unavoidable. And yet many caution against writing them off too soon, pointing to the group’s proven ability to change tactics. Already, they have redirected their efforts to launching terrorist operations around the world. And their ideology is still proving an effective recruiting sergeant. Presenter: Helena Merriman Producers: Estelle Doyle and Laura Gray(Photo:Syrian soldier sets fire to an Islamic State (IS) group flag after Syrian troops regained control the previous day of al-Qaryatain Credit: JOSEPH EID/AFP/Getty Images)

The death of cash has been predicted many times over the years. But in the last decade a future without coins and notes has become a real possibility thanks to the global development and adoption of cashless systems. Some banks in Scandinavia are already refusing to accept or hand out cash. And, in nations with poor banking infrastructure, the growth of cashless has been explosive. Millions of people around the world now conduct their lives with hardly any cash at all and in terms of convenience, most of us are winners. But warnings are sounding about the driving forces behind this shift. Are we in danger of getting rid of our cash without really understanding the consequences? Presented by Linda Yueh.(Photo: View of a smartphone displaying the 'Contactless' application. Credit: Getty Images)