Last month Nato ran a military exercise involving over 400 people from 16 countries. It was the most advanced ‘live-fire’ cyber-defence exercise ever carried out. The point of it all? To help Nato countries prepare for an all-out cyber attack. The former US Secretary of Defence, Leon Panetta, has said “there's a strong likelihood that the next Pearl Harbor could very well be a cyber attack that cripples our power system or our grid, our security systems, our financial systems, our governmental systems. This is a real possibility in today's world”. But how real is the threat of cyber warfare? Four expert witness help us separate fact from fiction.(Photo:Binary code cyber war. Credit: Profit_Image/Shutterstock)

In 2000 the world committed to reduce child mortality rates by 2015. At the time, there were on average 90 under-five deaths per 1,000 live births globally. Now there are 46. The UN says that means 17,000 fewer children are dying every day. Unicef has described the improvement as “one of the most significant achievements in human history”. But progress has been uneven. We look at one of the unexpected stars of the race to tackle child mortality – Rwanda – which, between 2000 and 2015, achieved the highest average annual reduction in the under-five mortality rate in the world. How did Rwanda do it? And could other nations follow its example?(Photo: Children Smiling Credit: Wlablack / Shutterstock)

In a matter of months rebels have swept through Yemen, capturing the capital, forcing the president into exile and causing hundreds of casualties as a simmering conflict has exploded into war. But the causes are complex and confusing. The Houthi rebels are from Yemen’s north, and are now laying siege to the southern port of Aden. Are these geographical rivalries the key? The Houthi are Shia Muslims, supported by Iran. The rest of Yemen is mostly Sunni Muslim, and Saudi Arabia is leading a bombing campaign against the Houthi forces. So is this a sectarian conflict, or even a regional proxy war? And the Houthis have allied with former President Saleh, against Yemen’s current leader who replaced him in the transition after Yemen’s 2011 revolution. Are the roots of the current conflict in the failure of that revolution to deliver progress? Four expert witnesses help to disentangle this complex web and explain what the conflict in Yemen is really about.(Photo: Houthi supporters demonstrate against recent UNSC sanctions. Credit: Yahya Arhab/European Photopress Agency)

Later this month 190 nations will meet in New York to discuss the nuclear Non-Proliferation Treaty (NPT), 45 years after it came into force. The Treaty prompted several aspiring nuclear-weapon nations to give up trying to get the bomb, but it also committed nuclear-weapon states like Russia and the US to pursue disarmament. Progress has been made. Overall stocks of nuclear warheads have dropped significantly. But is that the whole story? Both the US and Russia have committed huge sums – over a long timescale – to modernise their arsenals. One expert tells The Inquiry that these modernisation programmes amount to a new nuclear arms race - one which is creating a new generation of less powerful but more accurate weapons. Some argue that such ‘tactical’ weapons are more likely to be used. Another expert witness tells us that the failure of nuclear-weapon states to disarm threatens the NPT itself. And we hear disturbing testimony about the nuclear stand-off between India and Pakistan and a terrifying account of a largely forgotten incident in 1995 when the world came within two minutes of nuclear annihilation.(Photo: Explosion nuclear bomb in ocean. Credit: Romolo Tavani/Shutterstock)

Ahead of a historic meeting between Cuba’s President Castro and US President Obama, The Inquiry asks if the island nation’s warmer relations with America are a betrayal of its revolutionary past. More than half a century ago, Che Guevara became a global icon after he fought alongside Fidel and Raul Castro to overthrow an American-backed government and put into practice their socialist ideals. Now Raul Castro has made a deal with the Americans and the lifting of the long-standing economic embargo of Cuba is becoming a realistic prospect. We delve into Che Guevara’s past, the changes already happening in Cuba under Raul Castro and the Obama administration’s motives, to answer the question - what would Che say?(Photo: Fidel Castro and Che Guevara in the mid 1950s. Credit: Getty Images)

It seems something is missing from newspapers and TV bulletins - climate change. A story which dominated the news five years ago has dropped steadily down the agenda. One study has found coverage has dropped 36% globally in that time. Why? On The Inquiry this week we hear a tale of chronic political fatigue. We ask whether our hunter-gatherer brains simply aren't wired to think long-term. And we find out why climate change has all the hallmarks of a story likely to make newspaper editors groan. It could be – as one of our expert witnesses tells us – time to "change the narrative".(Image: A man places his hand on the parched soil. Credit: Press Association)

Who has authority in Tibet? Many Tibetans revere the Dalai Lama and support his goal of greater autonomy from Beijing. But officials there hold the opposite view. For them, he is a villainous traitor. Both sides agree that the role of Dalai Lama has been filled for centuries through reincarnation. The current one will turn 80 this year and Beijing is keen to control the process of finding his reincarnation. But he has said that the role will one day end. Better to have no Dalai Lama than “a stupid one,” he said. His comments sparked a furious reaction from Beijing this month. So, will the Dalai Lama reincarnate? Guests include a spokesman for His Holiness and a Chinese analyst in Beijing.

Forty-four years after President Nixon declared “war on drugs”, four US states have now agreed to legalise the sale of marijuana and a majority of Americans supports legalisation. Across the world, drug laws are being relaxed, from Uruguay to Portugal to Jamaica to the Czech Republic. Does this global trend mean the war on drugs has been lost? The Inquiry hears from expert witnesses including an ex-president and a former prosecutor who now defends drug traffickers.(Photo: A person rolling a joint of cannabis. Credit: Press Association)

The beheading of 21 Egyptian Christians on a Libyan beach has exposed the lawlessness of the country ruled by Colonel Gaddafi until 2011. The internationally-recognised government is trying, without much success, to run the country from the eastern city of Tobruk. In Tripoli, another body claims to be the legitimate government. But is the real power struggle between the militias associated with each group – and where does the so-called Islamic State fit in? With neighbours near and far getting involved to push their own agendas, we investigates the forces operating in Libya and what they want. (Image: A Libyan man waves his national flag. Credit: Abdullah Doma/AFP/Getty Images)

The murder and disfigurement of a 20-year-old woman in southern Turkey has prompted nationwide protests. Demonstrators have chanted the victim’s name, Ozgecan Aslan, and claimed that Turkey is becoming increasingly misogynistic. They point to growing reports of violence against women and restricted access to abortion. Hundreds of thousands of women have tweeted #sendeandat – 'tell your story' in Turkish - to share their experiences of abuse. The powerful president, Recep Tayyip Erdoğan, says that violence against women is the “bleeding wound” of Turkey. But he has also said that women are “not equal” to men. So, is it life getting worse for woman in Turkey? Expert witnesses include a leading Turkish feminist and a member of the governing AK party.(Image: People hold posters of Ozgecan Aslan. Credit: Adem Altan/AFP/Getty Images)