Since 2006 the WikiLeaks website has been publishing secret documents and material obtained from whistleblowers and other sources. Many of the confidential files published by WikiLeaks have been revelatory. The site has frequently made news around the world. But in 2016 Wikileaks published hacked emails relating to Hillary Clinton and her presidential bid. Those leaks appeared to serve the interests of the Trump campaign and were – according to US intelligence – probably provided to Wikileaks by Russian sources. So, this week on The Inquiry, we’re asking: can you believe what you read on WikiLeaks?

(Photo: Wikileaks founder Julian Assange speaks to the press after appearing at Belmarsh Magistrates court in London, England. Credit: Getty Images)

"No deal is better than a bad deal." So said Britain's Prime Minister Theresa May, clarifying her country's position on Brexit negotiations with the EU. In the absence of a deal with the EU Britain would “revert to WTO rules” after Brexit. But what does that mean, exactly? The Inquiry has the answer. Presenter: Linda Yueh Contributors: Emily Lydgate, University of Sussex Alan Winters, UK Trade Policy Observatory Hosuk Lee-Makiyama, European Centre for International Political Economy Adam Marshall, British Chambers of Commerce

(Photo: German Chancellor Angela Merkel and Britain's Prime Minister Theresa May arrive for a statement prior to a meeting at the Chancellery in Berlin, Germany, on November 18, 2016. Credit: Getty Images)

'Do we want his finger anywhere near the button?' Hillary Clinton asked during the US election campaign, referring to Mr Trump and the nuclear arsenal. But how close is an American president's finger to 'the button'? How close is anyone’s? We explain how the nuclear weapons systems of the US, Russia, Britain and China work – and how much power any one individual has over them.

(Photo: A Trident Ii, Or D-5 Missile, Is Launched From An Ohio-Class Submarine. Credit: Getty Images)

In 2002 US military personnel at Guantanamo Bay in Cuba were given 96 hours to prepare their sleepy base for the arrival of hundreds of prisoners. “The worst of the worst,” they were told. Beyond US jurisdiction, with no clear legal framework, prisoners accused of terror offences have been held there indefinitely without charge ever since. For many, Guantanamo has stained the image of the United States. When President Obama came to power in 2008 he vowed to close it. He failed. In this week’s Inquiry we are telling the full story of Guantanamo - from its creation to the so-called “forever prisoners” held there today.

Presenter: James Fletcher

(Photo: A US soldier walks next to a razor wire-topped fence at the abandoned 'Camp X-Ray' detention facility at the US Naval Station in Guantanamo Bay, Cuba. Credit: Getty Images)

It’s a question humans have asked forever. Are we alone in space? But it wasn’t until the late 1960s that humans started an organised, systematic hunt for extra-terrestrial intelligent life. We have listened to radio waves, peered through the celestial dust and beamed The Beatles to distant planets. So how’s it going? Is there anybody out there? This is the story of the search for extra-terrestrial life.

Presenter: Helena Merriman

(Photo: The ALMA, an international partnership project between Europe, North America and East Asia, with the cooperation of Chile. Credit to Getty)

Food production accounts for as much global greenhouse gas emissions as all forms of transport combined. That’s why many scientists think we can’t tackle climate change without addressing what we eat. So – in this week’s Inquiry – we’re looking at alternative climate-friendly diets and asking what it would take to move the world towards them.

Presenter: Helena Merriman

(Photo: Friends having a vegetarian meal. Credit: Shutterstock)

A lot has gone wrong this year. We are not talking about Brexit or the election of Donald Trump – both of which split opinion in Britain and the US. We are talking about terror attacks, the brutal conflict in Syria, and the thousands of migrants who died trying to reach Europe.

Good things did happen. But the good news was mostly buried under the bad. So we wanted to find about four things that went right in 2016. And, we talked to the people who made those things happen. Four amazing stories united by one thing - the ambition of a small number of extraordinary people to achieve the seemingly impossible. (Photo: Betrand Piccard in his pilot seat, permission from Solar Impulse, Teresita Gaviria watches the announcement made by the Colombian government and the FARC guerrillas, Getty Images, Sophien Kamoun and Dr Herath with kind permission)

It’s a surprisingly simple idea: to end long-term homelessness, give every person living on the streets a home. It can also be surprisingly effective. Medicine Hat, a city in Canada, recently became the first city to end homelessness in this way. The approach is known as Housing First, and – unlike many other homelessness initiatives – it doesn’t require homeless people to make steps towards solving other issues like alcoholism, mental health problems or drug addiction before they get a home. But is this approach solving the problem, or simply moving it off the streets?

Presenter: Helena Merriman

(Image: A homeless man with his dog outside a building. Credit to Getty)

We see and hear about Aleppo almost daily as news stories emerge of the hardship endured by its besieged people. After years of bombardment this once majestic place, the 'jewel' of Syria and one of the world's oldest inhabited cities, has been reduced to rubble. Thousands are dead. The residents who remain in the rebel-held parts of the city suffer from the ever-present threat of barrel bombs, while the international community has repeatedly failed to find a workable solution.

But why is Aleppo such an important part of the story of the war in Syria? The answer lies in Aleppo's historic role as a strategic city for so many people over the centuries, from Silk Road merchants of medieval times to the Assad regime and the forces currently battling for control of the country. Four Syrians, including one current Aleppo resident, tell us what life has been like in the city during its long and turbulent history.

(Photo: The Unesco-listed citadel (C) in the government-controlled side of the divided Syrian city of Aleppo. Credit: Getty Images)

Turkey first applied to join the European club over 50 years ago. Over the subsequent decades-long flirtation, enthusiasm for the EU in Turkey has remained high. Integrating with Europe, it was thought, would spur modernisation and economic development. But the country is changing under President Erdogan – who recently survived a coup attempt – in ways which deepen doubts in Europe about whether Turkey really shares its values. And enthusiasm in Turkey for the EU has begun to ebb away, as fewer and fewer Turks believe the EU will ever fully embrace them. So, our question this week: does Turkey still want to join the EU? Contributors: Aykan Erdemir, former Turkish politician; Amberin Zaman, journalist and fellow at the Wilson Center; Senem Aydın-Düzgit, professor in international relations at Sabancı University; and Sinan Ulgen, scholar in Turkish foreign relations at Carnegie Europe.

Presenter: Chris Morris Producer: Julia Ross

(Photo: European Commission President Jean Claude Juncker welcomes Turkish President Recep Tayyip Erdogan at the EU Commission in Brussels, Belgium, 05 October 2015. BBC Copyright, Elvis)

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)