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 Alexander

Producers: 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)

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.

Producers: Estelle Doyle and Sarah Shebbeare Editor: Richard Knight

(Photo: Facebook CEO Mark Zuckerberg delivers a keynote address during the Facebook f8 conference in San Francisco, California. Credit: Getty Images)

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)