China has long been keen to assert its authority in the South China Sea. In recent years, it has undertaken a huge programme of island-building to stake its claim to the region. Fiery Cross, once a tiny reef, is now a fortified airbase. And this is just one of China’s seven artificial islands in the Sea.But China is not the only one. Bordered by seven states, many others also claim parts of the South China Sea as their own. Experts warn these hotly contested waters could be a flashpoint for conflict in 2018.Why is the South China Sea so important to China? (Photo: Fiery Cross. Credit: CSIS Asia Maritime Transparency Initiative/DigitalGlobe)

The EU’s launched the ‘nuclear option’ against Poland, the first time it’s triggered the disciplinary measure in its history. They say recent changes to the legal system mean there is a serious threat to the rule of law and as a punishment, Poland could lose its voting rights in the European Union. The ruling party say this is an attack on Poland and that the EU should not be telling them what to do. The government says that actually their judiciary is threatened by the legacy of communism which is why they have made the legal reforms. They also say they’re being singled out by the EU for their refusal to take refugees, which they claim pose a threat to their country. If you believe the government, there are lots of threats to Poland, but what is actually being threatened and is there something far greater at stake? What is the greatest threat to Poland?Presenter: Ruth Alexander Producer: Phoebe Keane(Photo: Right-wing nationalist protesters burn the European Union flag in 2015. Credit: Natalia Dobryszycka/AFP/Getty Images)

In 2017 the black flag of the Islamic State group flew in the southern Philippines as a mixture of local and foreign fighters attacked the Islamic City of Marawi. While the government did eventually regain control, it took five months to break the siege and many terrorist leaders escaped during the fighting. It's led to fears that the extremist violence could spread. In this Inquiry we investigate the long history of conflict which provided a fertile place for IS's Islamist ideas to grow, and ask how important the region is to IS now that they're retreating in the Middle East.(Image: Destroyed buildings in what was the main combat area in Marawi. Photo: Merlyn Manos/Getty Images)

In 1994 a United Nations conference, backed by 173 countries, announced that ‘female genital mutilation’ was a “violation of basic rights and a major lifelong risk to women’s health”. Agreeing it should end, international agencies and charities quickly swung into action, and over the next two decades millions were spent on campaigns to eradicate the practise around the world. Today though, pricking or cutting of the genitalia still happens to an estimated 3 million girls a year in 30 countries, and some experts are saying we should rethink how we tackle it. In this episode of The Inquiry we talk to four expert witnesses, all with very different views on what the next steps should be. This programme contains frank discussions of a physical and sexual nature.(Image: A demonstration against female genital mutilation at the Nairobi World Social Forum in Nairobi, Kenya. Credit: Marco Longari/Getty Images)

Making sense of the digital currency and the ideology of its founders, fans and future.In 2010 a developer spent 10,000 bitcoin to buy two pizzas. Seven and a half years later that was the equivalent of over $80m. Bitcoin has been exploding in value throughout 2017 as more and more people buy into the idea of a digital currency. Traditional financial institutions have even begun to get involved. But far from a mainstream investment, Bitcoin started life as an idea from the radical cypherpunk movement, who wanted to use decentralised technologies as a way to disrupt governments and corporations.In this edition of The Inquiry we trace the history and development of Bitcoin – and ask whether its future will stay true to its libertarian roots.(Image: The Digital Cryptocurrency Bitcoin. Photo Credit: Dan Kitwood/ Getty Images)

What next for North Korea? Kim Jong-un's nuclear ambitions and their global repercussions are explored in this special, extended edition of the programme.After a year of repeated weapons testing by the secretive regime that’s sparked a war of words with the United States, Ruth Alexander brings together six expert witnesses to dive deep into the detail of what is one of the biggest geopolitical challenges of our time.Their discussion examines North Korea’s weapons capability, the mind-set of its leader, the chance of war breaking out and the possibilities of finding a diplomatic solution.(North Korean leader Kim Jong-Un, flanked by vice-chair of the State Affairs Commission Choe Yong-Hae (L) at an opening ceremony. Photo credit: Ed Jones/Getty Images)

Governing moon miners, asteroid hunters and space junk sounds pretty tricky, but we better get our act together. This year the majority of space launches included commercial enterprises. Space is no longer just the playground of governments but companies; companies that want to mine the moon for water that they could sell as rocket fuel, companies that want to mine the moon for helium -3 which could be sold and used as energy back on earth and companies that want to mine asteroids for platinum that they could sell for huge profits. But is this legal? The Outer Space Treaty, a set of laws written in the 1960s, says no state can conquer or own the moon or any other celestial body. So if you can’t own the moon, can you sell what you find on it? Perhaps it’s time for a new set of laws. So, how do we rule the universe?(digital illustration: Somewhere in the Universe: NASA's Kepler mission discovers a world orbiting two stars. Credit: NASA/JPL-Caltech via Getty Images)

There is a place on the internet where almost two billion of us regularly go – many of us, every day. Facebook: the social network which Mark Zuckerberg started in his university dorm room and which has grown, in a little over a decade, into one of the most valuable companies in the world. But what does Facebook’s lines of computer code do with the data we give it – and what could it do in the future? Just how powerful is Facebook's algorithm? The answer will surprise you.Produced by Estelle Doyle and Sarah Shebbeare This programme was first broadcast in April 2017.(Facebook CEO Mark Zuckerberg delivers a keynote address during Facebook's F8 conference in San Francisco, California. Credit: Getty Images)

Forty-two Americans die every day from an overdose involving painkilling prescription opioids. President Donald Trump recently declared the US opioid epidemic a national public health emergency. Yet in the world’s poorest countries, cancer patients and people recovering from major surgery often get no effective pain relief at all. Why is access to prescription painkillers so unequal? And is the shortage of opioids in much of the world getting the attention it deserves?(Photo: View of poppies in a poppy field in the state of Guerrero, Mexico. Credit: Pedro Pardo/Getty Images)

Missiles, fighter jets and mines waiting on the sea bed - war games in the gulf. Tension between Iran and Saudi Arabia is at an unprecedented level since a missile was intercepted over Saudi Arabia’s capital city. The Saudi Crown Prince blames Iran and says the attack may be considered an act of war. This is what would happen if they did go to war.(Photo: An Iranian missile is test-launched during war games in Qom, south of Tehran. Credit: Shaigan/Getty Images)

The world’s most profitable company is accused of aggressively dodging tax. Leaked documents in the Paradise Papers show Apple moved hundreds of billions of dollars in untaxed foreign profits to Jersey, where foreign companies pay no corporation tax. Yet Apple says it pays “every dollar it owes in every country around the world”. Confused? Not for long.(Customers wait in front of the giant Apple logo for the store to open in Munich, Germany. Photo Credit: Christof Stache/GettyImages)

He’s pushed through reforms but some fear there is a darker desire driving the ruler. In one night, Crown Prince Mohammad bin Salman arrested over a dozen Princes and government ministers on corruption charges. To turn on his own royal family, he must be serious. But is corruption the Crown Prince’s real target or is this a power grab? There are also fears that the aggressive stance he has taken with Lebanon, Yemen and Qatar is increasing tensions with regional rival Iran. If the tension reaches a tipping point, there are fears the conflict could widen beyond the region. So what is he up to? What does the Saudi Crown Prince want?(Photo: Saudi Crown Prince Mohammed bin Salman, in Riyadh on October 24 2017. Credit: Fayez Nureldine/Getty Images)

Academic research stands accused of turning a blind eye to dodgy data, failing to reconcile contradictory findings and valuing money over knowledge. We examine the criticisms, which go the very heart of our pursuit of knowledge.(Photo: Scientist working in a research laboratory. Credit: Shutterstock)

The growth and reach of a group labelled a ‘terror force’ by President Trump. On 13 October President Trump announced new sanctions against Iran’s Islamic Revolutionary Guard Corp for supporting terrorism. But what is the Revolutionary Guard and what is its role in Iran and the Middle East? The group started as an army to protect the values of the Iranian revolution of 1979, but their role in fighting a long and brutal war with Iraq strengthened their military clout considerably. Today their forces work beyond their borders and have played a key role in the fight against so-called Islamic State. But they are no longer just an army, they run construction projects, run most of the telecommunications industry and even have a news agency. So how powerful is the Islamic Revolutionary Guard Corps?Presenter: Ruth Alexander Producers: Phoebe Keane and Jo Casserly(Photo: Iran's elite Revolutionary Guard special forces participating in military manoeuvers. Credit: Getty Images)

Why internal conflicts end and what it might mean for Syria. The war in Syria is in its seventh year and there are few signs that an end is in sight. Yet over the years, other seemingly intractable civil conflicts have, eventually, been resolved. So, how did they do it and what lessons are there that might help Syria?(A Kurdish Syrian woman walks with her child past the ruins of the town of Kobane in northern Syria. Credit: Yasin Akgul/Getty Images)

The head of the Roman Catholic Church has been accused of aiding the spread of heresy. A petition criticising the ambiguity of Pope Francis' statements on the treatment of people who have divorced and remarried is the latest twist in a fierce debate which is dividing Roman Catholics. The argument centres on whether divorcees on their second marriages should be able to receive Holy Communion, a ceremony that is central to the Christian faith. However, the dispute goes much deeper than that. At its heart, it is an argument over what it means to be a Roman Catholic and what the role of the Pope, and the Church, should be.Presenter: Ruth Alexander Producer: James Fletcher and Helen Grady(Photo: Pope Francis waves to thousands of followers in Manila, Philippines. Credit: Lisa Maree Williams/Getty Images)

From driverless cars to "carebots", machines are entering the realm of right and wrong. Should an autonomous vehicle prioritise the lives of its passengers over pedestrians? Should a robot caring for an elderly woman respect her right to life ahead of her right to make her own decisions? And who gets to decide? The challenges facing artificial intelligence are not just technical, but moral - and raise hard questions about what it means to be human.(image: PaPeRo communication robot at the Robodex trade show in Tokyo, Japan, 18 January 2017. Photo credit: Tomohiro Ohsumi/Getty Images)

We all do it: ask a search engine things we wouldn’t dare ask a friend, post our lives on social media, hit the ‘agree’ button on privacy conditions we never read. This is life in our online age. To get our favourite apps and services for free, we provide companies with the intimate details of our lives. Businesses we’ve heard of, and many we haven’t, make money off this data in ways we may not fully realise. And almost every week it seems there’s another data breech – Equifax, Sonic, and Deloitte have been hacked in the last month alone. Each time the private data of millions of people is compromised. Can we control who knows what about us? And are we comfortable with how much information we’re giving up and how it might be used, or mis-used? This week the Inquiry asks “Is Privacy Dead?”(image: Shutterstock)

The list of nations legislating to ban the sale of petrol and diesel cars is growing. But these restrictions won’t come into effect for decades. Air pollution contributes to thousands of early deaths each year and the scandal known as Dieselgate, when vehicle manufacturers admitted tampering with emissions tests, made us more aware of the polluting power of the diesel engine. Automotive technology is advancing quickly, but will greener vehicles really replace the combustion engine? Hybrid and electric cars are better for the environment but more expensive, and petrol stations are easier to find than charging points.This edition of the Inquiry asks, if we wanted to, could we ban the sale of diesel and petrol cars now?(image: Cars sit in gridlock in heavy fog (pollution) in Beijing China. Photo Credit: Guang Niu/Getty Images)

North Korea continues to rattle the world with its rapidly advancing weapons programme. Diplomacy with this Hermit Kingdom is broken and UN sanctions have little effect curtailing the nuclear ambitions of the country’s enigmatic leader Kim Jong–Un. As its closest neighbour and biggest ally, can China solve the growing threat - with whatever options remain?(image: Chinese/N.Korean sign beside the Sino-Korean Friendship Bridge connecting the Chinese border city of Dandong to North Korea over the Yalu river. Credit: Mark Ralston/Getty Images)

Do we have the power to avoid the natural forces of intense rainfall? With rising sea levels and the threat of climate change, the risk of death due to floods seems an insurmountable challenge. But there are some surprising facts in the figures on flood deaths. In developed countries like the US, more men die in floods than women and it is 30% of white men who are of particular concern. We hear from four expert witnesses from across the globe, who share different options for change. Their ideas are both obvious as well as innovative, both low cost for use in developing countries like Bangladesh and high-tech like in the Netherlands. We also hear from the one place in the world which seems to be saving more lives in the face of devastating floods and storm surges than anywhere else on the planet.Presenter : James Fletcher Producer: Nina Robinson(Photo: Officials distribute medicine to villagers affected by the monsoon flooding across India, Nepal and Bangladesh. Credit: Biju Boro/Getty Images)

Cemeteries around the world are fast running out of space. As more and more people choose to live in cities, some can't even cope with the ashes left after cremation. Deep questions about our communities, cultures and mortality emerge as The Inquiry asks: what can we do with our dead?The programme script says that "only the very wealthiest can afford to rest in the ground in Hong Kong and Singapore". This is true for Hong Kong but Singapore's National Environment Agency has been in touch to say that you do not have to be wealthy to be buried in the government run cemetery.(image: A crowded cemetery in Hong Kong. Photo credit: Dale De La Rey/Getty Images.)

North America’s most notorious racist group, the Ku Klux Klan fought the end of slavery in the 19th century, opposed civil rights in the 20th century and now forms part of a new extreme-right wing movement protesting openly, on America’s streets. Presented by James Fletcher and produced by Kate Lamble, The Inquiry asks four expert witnesses to answer this pressing question; how has the KKK managed to last so long? The answer can be found by looking at the origins of the KKK and the power of the white supremacist idea which became infamous for its’ distinctive costumes and deadly violence.The American concept of freedom of speech has also helped give the KKK longevity. The views of the groups’ members are not shut down by the authorities. Rather, the KKK is allowed to speak and operate openly, within certain limits of the law. The hope is that counter protest and dialogue will expose the hatred and bigotry of its members.Through hearing the views of one reformed racist, we learn how the group have been opportunistic in recruiting members. These include troubled young men, looking for family, security and meaning to their lives.Finally, modern day technology has helped to spread the KKK’s message throughout the world via the internet. The group has been managed to mobilise and has recently, become emboldened by the election of President Donald Trump.(Photo: Torchlight Parade by the Ku Klux Klan, October 1951. Photo credit: Keystone/Getty Images)

Video games are a huge industry, bigger than Hollywood, and billions of people around the world play them for fun. But new economic research in the US suggests that young men are dropping out of work to play games more. This is both because some jobs are becoming harder to find and less rewarding, and because video games are becoming more and more attractive. The gamers say they are happy, but the research has sharpened long-standing concerns about video games. Will there be a 'lost generation' of young men sitting in their parents' basements, frittering their lives away on mindless games, with disastrous long-term effects for them and the economy? Are video games a waste of time?(Photo: A visitor plays on a computer while visiting the Gamescom 2017 video gaming trade fair in Cologne, Germany. Credit: Lukas Schulze/Getty Images)

Smears, bots and bags of cash - we reveal some of the tricks used for fiddling elections around the world. German Chancellor Angela Merkel's security chiefs say Russian intelligence is actively trying to influence next month's German elections. Meanwhile, from the US to the Netherlands, countries are becoming increasingly wary of election interference. So how do you fix someone else’s election? Hear answers from people who've studied it and even been involved.Presenter: Neal Razzell Producers: Phoebe Keane, Emily Craig Editor: Emma Rippon(Photo: Voters go to the polls in the contentious presidential election between Hillary Clinton and Donald Trump in Las Vegas, Nevada Credit: Ethan Miller/Getty Images)

A story of crime and often no punishment. South Africa's notoriously violent record has been getting worse. The number of murders and violent crimes is rising as public confidence in the police falls. Officers themselves have been linked to a series of high-profile cases, including spectacular heists at the country's main international airport. South Africa's police minister has called for "a firmer, disciplined force". So, are South Africa's police failing?(image: A riot police officer gets ready to fire a stun grenade into a crowd during clashes in Johannesburg May 8, 2017. Credit: Gulshan Khan/ Getty Images)

You might think simple rules decide the creation of nation states. You'd be wrong.There are plenty of people out there who want their own state - like in Iraqi Kurdistan and Catalonia, which both have independence referendums coming up. Yet the national governments in Baghdad and Madrid say the votes - whatever their outcome - won't result in new countries. So how do you start a new country? Making sense of an atlas dotted with exceptions, special cases and lands in limbo, we ask: who gets to have their own country?(Photo: Young boy holds a pro-Independence Catalan flag (Senyera) during Catalonia National Day. Credit: Quique Garcia/Getty Images)

Alarm about North Korea has spiked. Earlier this month, the North claimed to have successfully test-launched an intercontinental ballistic missile that could hit Alaska. Some experts estimate that North Korea is now 18 to 36 months away from launching a missile able to reach Los Angeles. President Trump has warned that a "major, major conflict" with North Korea is possible. His closest advisers have said that "the era of strategic patience is over".So, in this week's Inquiry, we take a look at the two sides' war plans and ask: what would war with North Korea look like? Producer: Sarah Shebbeare Presenter: Neal Razzell(image: A combined fire demonstration of the North Korean People's Army celebrating their 85th anniversary on 26 April 2017. Credit: STR/AFP/Getty Images)

Every single second, 20,000 single-use drinking bottles are sold around the world. That is more than a million pieces of non-biodegradable rubbish produced every minute. And as demand grows in developing economies, so will the mountains of waste, with much of it ending up in the ocean. We learn how the invention of the plastic bottle spawned an industry that has quickly got us hooked. We hear the consequences of our addiction from the man who has dedicated his life to The Great Pacific Garbage Patch. And, with one estimate that by 2050 there will be more plastic in our oceans than fish, we ask if we now need a radical solution. Is it time to ban the plastic bottle?Presenter: James Fletcher Producers: Simon Maybin and Sarah Shebbeare(Photo: A bottle of water sits on the floor inside a recycling facility. Credit: Getty Images)

"This structure has novel features, which are of considerable biological interest." It was perhaps the greatest understatement of all time - the announcement more than six decades ago of the discovery of the shape of a single human DNA. The double-helix structure is now one of the world's most recognisable icons. Knowledge of it has transformed the fight against everything from disease to crime.That revolution was brought to us by an elite. It took the world's most eminent scientists, backed by the treasuries of the United States, the United Kingdom and private markets to go from the discovery of that one gene, in 1953, to map the more than 22,000 genes that make up a human being in 2000. Mapping the genome, as it was known, was likened to "learning the language in which God created life."Genetic research has since become democratised. Incredible new technologies now allow labs all over the world to not only learn the language of creation, but to write it...and edit it. Do-it-yourself gene editing kits are available online for less than $100. Gene editing offers breathtaking promise - eliminating disability and disease. But the rapid spread of this powerful technology is leading some who've been at the forefront of the research to warn against unintended consequences, and question whether the rush for miracle cures could bring hellish side-effects.So this week, The Inquiry asks, Is Gene Editing Out of Control?(Photo: CRISPR CAS 9 Clustered regularly inter spaced short palindromic repeats. segments of prokaryotic DNA containing short repetitions of base sequences. gene editing, genome editing. Credit: Shutterstock)

The tiny state behind a global diplomatic feud.Qatar's landmass is so small it could fit into the UK 20 times over. Its citizen population is just a few hundred thousand. Yet this desert country finds itself at the centre of a geopolitical dispute, with its powerful neighbour Saudi Arabia leading a blockade against it and President Donald Trump firing off critical Tweets.So how did this bantam-weight state end up slogging it out with the world's heavyweights? In other words, what's so special about Qatar?Presenter: James Fletcher Producer: Simon Maybin and Sarah Shebbeare(image: Doha city skyline, with armoured vehicles, Qatar. Credit: Karim Jaafar/Getty images)

China is currently developing the biggest infrastructure initiative of all time. Called the Belt and Road initiative, the trillion dollar plans involve working with other Asian countries to build hundreds of new roads, high speed trains, ports and pipelines across continent to mimic the ancient Silk Road trading routes. The project offers a clear economic opportunity, but the diplomatic ties that form as a result could have the potential to change the current world order. Presenter: Ruth Alexander Producer: Kate Lamble(image: Local people control their sheep and goats on the Karakoram highway in northern Pakistan, part of the new Silk Road. Credit: Aamir Queeshi/AFP/ Getty Images)

On 12 June 2017 thousands of protesters took to the streets in over 160 towns and cities across Russia. Opposition leader Alexei Navalny called on people to march against corruption from Kaliningrad in the west to Yuzhno-Sakhalinsk in the east, in bustling cities and significantly, in rural towns where support for President Putin is strong. This is unusual. Protests are usually restricted to the urban elites in Moscow. So who is Navalny and how has he managed to bring so many people out on the streets? Our expert witnesses assess the strength of the opposition movement in Russia. They explain that the protests reveal a greater threat to Putin. The mobilisation of a young generation who do not believe what they see on state TV and are turning to opposition politics online instead. Presenter: Ruth Alexander Producers: Phoebe Keane and Estelle Doyle (Photo: Russian opposition leader Alexei Navalny speaks during a rally in Lyublino, a suburb of Moscow, 20 September 2015. Credit: Getty Images)

When violent jihadis struck London last Saturday, the rolling news networks kicked quickly into action. The story became front-page news around the world and dominated the UK's news media for days, with ever more information on the attack, the victims and the perpetrators. It was shocking, horrific - and perhaps also exactly what the terrorists wanted.Terrorists rely on the world's media to spread their message of fear and their ideology. Maybe if there was less media coverage of such attacks, it would frustrate the people behind them. We look at four democratic countries where attempts have been made to limit the media impact of terrorism. Drawing on the lessons learnt, how do you report terrorism?Presenter: Ruth Alexander Producer: Simon Maybin and Phoebe Keane(Photo: Various newspapers spread out headlining the London Terror attacks)

Many of us find our jobs stressful, underpaid and the hours too long. But few would complain about work being less physically strenuous than in the past. And yet, new research shows that the decline in physical activity at work is key to explaining the obesity epidemic. So - is work now too easy? And if it is, can this be reversed? Producers: Estelle Doyle and Phoebe Keane Presenter: Michael Blastland(Photo: Office workers at desks using computers in an office. Credit: Getty Images)

Does the experience of poverty actually take a physical toll on your brain? The Inquiry investigates the scientific claims that being poor affects how our brains work.It's well known that children from poorer backgrounds do worse at school. And adults who are poor are often criticised for making bad life decisions - ones that don't help them in the long-term.Some say the problems are rooted in the unfair way our society functions. Others argue it's simple genetics. But a growing body of research suggests that something else may be going on too.The Inquiry assesses the evidence and asks: does poverty change the way we think? Presenter: Ruth Alexander Producers: Simon Maybin and Phoebe Keane(Photo: Concept of human intelligence with human brain on blue background. Credit: Shutterstock)

Brexit showed that the issue is now among the most important for British voters. And that’s likely to continue in June’s UK general election, as major parties have made their positions on immigration central to their campaigns. And yet for decades, immigration was a no-go area for mainstream debate. Following racial tensions in the 1960s, it came to be perceived as a proxy for racism. Today it is one of the most salient issues in British politics. What changed?Producer: Estelle Doyle Presenter: Ruth Alexander(Photo: Border Force check the passports of passengers arriving at Gatwick Airport in London, England. Credit: Getty images)

Once the richest country in South America, Venezuela is now in deep economic crisis.Children in school are fainting from hunger; patients are dying from the lack of basic medicine. As prices spiral out of control, cash is carried not in wallets, but in backpacks. Street protests over the crisis are growing in size and frequency - and the government's response becoming ever more authoritarian.Yet in 1970, Venezuela was among the wealthiest countries in the world. It was held up as a beacon of democracy and stability - an example of a successful developing economy that turned oil resource wealth into riches. So what went wrong? How did Venezuela go from so rich to so poor?Presenter: Linda Yueh Producer: Simon Maybin(Photo: A father and daughter rest while someone holds their place before sunrise in a long line to buy basic foodstuffs at a supermarket in San Cristobal, Venezuela. Credit: Getty Images)

Tensions between the US and North Korea are running high. Kim Jong-Un has been testing long-range missiles and nuclear weapons. The Trump administration wants Pyongyang to end its nuclear weapons programmes and has said “all of our options are on the table” in pursuit of that goal. North Korea has said that a "super mighty pre-emptive strike” is planned if the US uses military force against them. But – our question this week – how did this poor and isolated country develop nuclear weapons in the first place?Presenter: Ruth AlexanderProducers: Kate Lamble, Phoebe Keane and Estelle Doyle(Photo: North Korean leader Kim Jong Un meets scientists and technicians in the field of researches into nuclear weapons. Credit: Reuters)

Yuval Noah Harari, the author of Sapiens and Homo Deus, explores the long history of inequality – from the Stone Age onwards – and asks whether we are on the brink of creating a huge “economically useless” underclass, unable to keep up with enhanced humans, the owners of increasingly valuable data and, eventually, artificial intelligence. Presenter: Ruth Alexander Producer: Estelle Doyle Editor: Richard Knight (Photo: Yuval Noah Harari, Credit: Daniel Thomas Smith)

In 2014 marijuana was legalised for recreational use in Colorado and Washington states in the US. Oregon, Alaska, California, Nevada and Massachusetts have all followed. These votes were the result of fierce campaigns. Activists argued that changing the law would eliminate the black market in marijuana; creating a legitimate, taxable industry and allowing the police to focus on more serious crime. Opponents feared more people would become cannabis addicts and predicted an uptick in health problems and robberies. So – three years in – what happened?Presenter: Ruth Alexander Producers: Kate Lamble and Phoebe Keane(Photo: Jars full of medical marijuana are seen at Sunset Junction medical marijuana dispensary in Los Angeles, California. Credit: Getty Images)

It’s two years since the start of the Saudi-led military campaign in support of the Yemeni government which was ousted by Houthi rebels. The war has been a disaster for countless civilians. Thousands have been killed and the country is on the brink of famine. The UN is calling it a humanitarian crisis. And yet it’s far from clear which – if any – of the multiple nations and groups involved in the conflict is working to end it. In other words, our question this week, why is no one trying to stop the war in Yemen? Presenter: Ruth Alexander Producer: Estelle Doyle(Photo: Houthi rebels, march in a parade during a gathering in the capital Sanaa to mobilize more fighters to battlefronts to fight pro-government forces in several Yemeni cities. Getty)

At a recent press conference on the new US budget questions were asked about funding for climate change initiatives. The answer was stark. “We’re not spending money on that anymore,” reporters were told, they’re a “waste of your money”. The new administration is sceptical about man-made climate change. Most of the world’s scientists and governments, however, are not. The Paris Agreement committed the world to prevent global temperatures from rising more than two degrees over pre-industrial levels. That target looked close to impossible even before the election of Donald Trump. So – our question this week – do we need a ‘plan B’? Scientists have been developing some very ambitious ideas to re-engineer our climate. They have created materials that could suck carbon dioxide out of the air and a scheme to pump reflective particles into the atmosphere. But – if ‘plan A’ fails – might any of these last-ditch ideas actually work?(Photo: The smoke stacks at American Electric Power's Mountaineer coal power plant in New Haven, West Virginia. Credit: Getty Images)

Every candidate in the upcoming presidential election in France is calling for change: change to the bureaucracy, the economy and even the culture. France, they say, is broken; society too divided, unemployment too high or the state too oppresive. Are they right? Is this call for change a tired political cliché – or a justifiable response to a deep set of problems? In other words – our question this week – what's wrong with France?Presenter: Estelle Doyle(Photo: A dejected France fan after defeat in the 2010 FIFA World Cup South Africa match between France and Mexico. Credit: Getty Images)

The UN has declared that South Sudan is in the grip of famine. Aid agencies have pointed the finger not at crop failure, weather or some other environmental problem. Humans, they say, have created this misery – misery which could easily have been avoided. The UN has also warned that conflicts in Yemen, Somalia and northeastern Nigeria mean there could soon be famine in those countries too, creating “the largest humanitarian crisis since the creation of the United Nations” in 1945. Humankind long ago figured out how to manage agriculture, store and distribute surplus produce or use trade to overcome hunger. So are all famines – like the one unfolding now in South Sudan – man-made? That’s our question on The Inquiry this week. Presenter: Maria Margaronis Producers: Phoebe Keane and Charlotte McDonald(Photo: A woman winnows grain to separate sorghum seeds from soil following an air-drop at a village in Nyal, in Panyijar county, south Sudan, on February 23, 2015. Credit: Getty Images)

Mosul is today the scene of the largest battle on Earth. Some 100,000 soldiers, police and militiamen are bearing down on the ancient Iraqi city. Backed by Western air power, their mission is to drive out the so-called Islamic State fighters who’ve occupied the city since 2014. Mosul holds enormous symbolic value to both sides. The IS leader declared himself “caliph” there; the Iraqis want to avenge their defeat there nearly three years ago. Between them are hundreds of thousands of civilians. The UN says they face "extreme risks": water, food and fuel are already scarce. This edition of The Inquiry tells the story of the campaign and asks how the final phase could end.(Photo: An Iraqi Special Forces soldier climbs through a hole in a wall as he searches for Islamic State fighters in Mosul, Iraq, 2017. Credit to: REUTERS/Goran Tomasevic)

Back in 2015 our radios and TV bulletins were full of stories of people trying to get to Europe. We saw distressing pictures as boats sank and lives were lost. Huge numbers of men, women and children tried to make their way by road, rail and foot to Hungary, Germany and beyond. There was anguish and fear in EU capitals. Now the story has slipped from the front pages. We find out what happened next.(Photo: Syrian refugees sit aboard a dinghy heading to the island of Lesbos early on June 18, 2015. Credit: Getty Images)

Our phones are powerful tools with lots of benefits – keeping in touch, accessing information and services and managing our lives. We are using them more and more, constantly picking them up. Even in situations where it is considered inappropriate, disadvantageous, or even dangerous, many people still find it hard to resist the urge to check their smartphones. Why do we find these mini computers in our pockets so compelling? Our expert witnesses explain how tech developers are tapping into established behavioural psychology theories about what gets us hooked. We hear how experiments conducted on pigeons can help explain why we cannot resist checking to see whether we have got email or a new like on social media and we reveal the tricks that companies use to keep us coming back for more.(Photo: People using their smartphones on the platform of a train station in Bangkok. A recent study showed smartphone owners are often connected all day. Credit: Getty Images)

President Trump has made no secret of his contempt for news organizations, stating that the media are "among the world's most dishonest people". He has described The New York Times as "failing", The Wall Street Journal as “a pile of garbage” and CNN as a “terrible organization” responsible for “fake news". The BBC? “There’s another beauty.” The President has made statements and assertions which are false. He uses Twitter to speak directly to the American people. His combative press secretary Sean Spicer said he plans to “hold the press accountable”. All this seems like bad news for what many Trump supporters call – derisively – the “mainstream media”. But might the opposite be true? Might Donald Trump, in fact, be good for journalism? That’s the question on The Inquiry this week.(Photo: Republican presidential candidate Donald Trump talks to reporters after the first prime-time presidential debate, Quicken Loans Arena, Cleveland, Ohio. Credit: Getty Images)