There are different routes to pariah status. North Korea, with its gross human rights abuses and illicit nuclear weapons programme tops the list and represents the classic pariah - completely ostracized from the international system. Another sure-fire way to become a pariah is to sponsor international terrorism, like Muammar Gaddafi’s Libya in the 20th century. But as his example shows, international rehabilitation can happen almost overnight. Then there are less clear cut pariahs like Zimbabwe, condemned by the West but very much part of the regional African system. Four expert witnesses examine these cases and explore whether the notion of a pariah state is meaningful in the 21st century multi-polar world. Presenter: Kavita Puri Producer: Lucy Proctor

(Photo: Ostracized /Getty Images)

Warnings about the approaching post-antibiotics apocalypse have been sounding for years. There are now strains of deadly bacteria that are resistant to all antibiotics. This means that doctors are faced with patients who have completely untreatable infections. Hundreds of thousands of people worldwide are dying due to antibiotic resistance - and this number is set to rise rapidly. If we carry on like this, scientists predict we will return to a pre-antibiotic era, where organ transplants, chemotherapy and C-sections are impossible.

We have come a long way since 1928, when the famous chance discovery of penicillin led to a golden age in which antibiotics were seen as wonder drugs, heralding in an age of huge medical advances and increased human life spans. But by the 1990s we were running out of new antibiotics and infections were again a killer. How did this happen?

Our expert witnesses are medic and historian, Dr Eric Sidebottom, Dr Scott Podolsky of Harvard Medical School, journalist Maryn McKenna and infectious disease specialist Brad Spellberg.

(Photo: A depiction EHEC bacteria. Credit: HZI/Getty Images)

The burgeoning relationship between China and Africa has been one of the great economic stories of the 21st century. Billions of dollars of investment and loans from China have created radical change in many African countries. But not everyone is happy, with some even claiming this is a new form of colonialism. As signs of discontent grow in countries like Zambia, and investment numbers start to slip down, we ask: is the China-Africa love affair over?

Contributors include:

Dr Lauren Johnston – Research Fellow, University of Melbourne Professor Lina Benabdallah – Assistant Professor of Politics & International Affairs, Wake Forest University Laura Miti – Executive Director, Alliance for Community Action Professor Stephen Chan – Professor of World Politics, School of Oriental and African Studies (University of London)

Presenter: Linda Yueh Producer: Beth Sagar-Fenton

(A Chinese railway worker drills holes on the newly put railway tracks in Dondo, outside Luanda, Angola. Photo credit: Per-Anders Pettersson/Getty Images )

Thousands died when an earthquake and tsunami struck Palu, Indonesia – but could more lives have been saved? Accusations have been made of a host of failings: alert systems that were out of action, sirens that didn’t sound, a government slow to give emergency help - even people who were too busy filming the disaster to run away. How much truth is there to this? Was everything done to warn people beforehand, and rescue people in the aftermath? We speak to experts on the ground and around the world to find out. Contributors include: Lian Gogali – Founder, Institute Mosintuwu Harald Spahn – Consultant geologist 2006-2013, German-Indonesian Tsunami Early Warning System project Harkunti Pertiwi Rahayu – Chair, Indonesian Association of Disaster Experts & Assistant Professor, Bandung Institute of Technology Mark Astarita – Former Director of Fundraising, British Red Cross Presenter: Kavita Puri Producer: Beth Sagar-Fenton

(A man looks for his belongings amid the debris of his destroyed house in Palu, Central Sulawesi, Sept 29 2018. Photo credit: Bay Ismoyo/Getty Images)

Delhi is one of the worst polluted cities in the world. Radical ideas like skyscraper-sized air purifiers are being proposed to clean the smog – can they work? There are lessons to be learned from other cities around the world about how to manage emissions. But will any city’s air ever be really clean?

(Image: A heavily polluted street in Delhi. Photo Credit: Arvind Yadav/Getty Images)

Most countries in the world have signed up to the idea that no child should work at all under a certain age – but is this the best approach? This week Nicolle, a 17 year old from Peru, has been part of a delegation of child labourers visiting the UN to ask them to rethink their ban on child labour. She’s been working since she was 8 years old, and says not only did her family need the money she earned, but working brought her status and respect. Some charities and experts working with child labourers agree that there are safe forms of child work. They say non-hazardous work can allow children to help their families, gain life skills, and even pay for the school uniforms and equipment they need to stay in education. But the UN and other former child labourers disagree, saying an outright ban is the only way to protect children from exploitation. We ask whether it’s time to rethink the ban on child labour.

Contributors include:

Benjamin Smith – Senior Officer for Child Labour, International Labour Organization Jo Boyden – Professor of International Development, Oxford University Zulema Lopez – former child labourer Kavita Ratna - Director of Advocacy and Fundraising, Concerned for Working Children

Presenter: Helena Merriman Producer: Beth Sagar-Fenton

Image: Girls collecting firewood in Eritrea, 2004 Credit: Scott Wallace/Getty Images

DNA testing is big business. Millions of people worldwide are finding out about their ancestry and genetic health traits by sending off a spit sample to one of the big consumer genetic testing companies. But what do your genes really tell you? And could genetic testing have harmful consequences for our health and for society? Four experts chart the rise of consumer genetic testing and examine the claims made and our expectations about the results.

Presenter: Helena Merriman Producer: Lucy Proctor

(image: Tube collecting saliva for dna testing of genetic markers. Photo By BSIP/UIG/Getty Images)

The story of how a line on a map becomes a hard state border that no one can cross. Korea was ruled as one Kingdom for a thousand years. They valued poetry and scholars helped rule the country. But their Kingdom was invaded by Japan. When Japan left, Russia and America raced to take their place. Amid frantic organising, a line dividing Korea in two was suggested. Who knew that line would become the front line in a war, eventually creating a hard border between two new countries?

This is a special edition that 10-14 year olds can also enjoy, but if you are not in that age bracket we hope that there’s something in it for you too. It’s a trial and we’d love to know what you think. Email [email protected] or tweet @bbctheinquiry – thanks to Niko, Christina and Sophie for your feedback. The Inquiry will be back to normal next week.

(image 2018: A North Korean student attends a class at Kang Pan Sok revolutionary school outside of Pyongyang. Credit: Ed Jones/Getty Images)

This is a special edition that younger listeners aged 10 to 14 can also enjoy. If you’re no longer in that bracket, don’t worry, The Inquiry as you know and love it will be back to normal after the next two episodes. It’s an experiment and we’d love to know what you think of it. Please email us [email protected] or tweet @bbctheinquiry.

What’s Killing Africa’s Elephants? Poachers, jewellery makers and angry farmers: the story behind the drop in elephant numbers across Africa.

Presenters: Priscilla Ngethe and Kate Lamble.

Image: African elephants (Credit: BBC)

Ever since it began, women’s sport has been beset by a fundamental question: who gets to compete as a woman? It’s a debate which is more heated now than ever. That’s because in a few months, athletics’ governing body, the International Association of Athletics Federations, will introduce controversial new rules, regulating the participation of athletes with disorders of sexual development, commonly known as intersex conditions. It’s a debate that goes far beyond sport - throwing up difficult questions about what separates men from women. In this edition of The Inquiry we plunge into this debate, which is troubling women’s sport.

Presenter: Helena Merriman Producer: Josephine Casserly

(image: Women's Athletics 200m at the 2018 Asian Games in Jakarta, Indonesia. Photo Credit: Yang Huafeng/China News/Getty Images)

Thousands of cyberattacks occur every single day. Some hackers steal credit card details or pilfer money from online bank accounts. Others cripple businesses, or even governments. As tensions mount in cyberspace, what are countries doing to strengthen their cyber power and build a hacking army? In this Inquiry, we delve into some of the world’s most intriguing cyber operations – including Iran, Russia and North Korea.

(Black Hat DEF CON cybersecurity conference in Las Vegas, Nevada USA. Photo Credit: Ann Hermes/Getty images),

It’s graduation day at the end of a religious summer school in Yemen’s Saada province. A class of young boys are off on a trip to a shrine. In a land of war, they are happy - jostling and full of energy on their school bus.

Moments later, most of the boys are dead. A Saudi-led coalition airstrike has hit their bus. The bomb that was dropped by the Saudis was made in the United States, and Saudi Arabia is the America’s single biggest customer when it comes to buying arms.

Critics argue that Donald Trump is quietly escalating America’s role in the Saudi-led war on Yemen, and many, including US Congress, have begun to question the relationship between the United States and Saudi Arabia. Will the US support Saudi Arabia no matter what? So on this week’s Inquiry we’re asking, who’s in the driving seat when it comes to the US – Saudi alliance?

Presenter: Krupa Padhy Producer: Marie Keyworth Researcher: Dearbhail Starr

(Photo: U.S. President Trump meets Crown Prince of Saudi Arabia Al Saud, (c) Getty Images)