Ever wanted to meet your historical heroes or explore the inventions of the future? Travelling in time has long been a dream of writers and filmmakers, but what does science tell us about how possible this would be to achieve in real life?

We explore how physics shows us that time runs at different rates depending on where we are and how we’re moving - time goes more slowly for astronauts on the international space station for example. We hear about the very dangerous ways we could possibly exploit this to skip forwards through time and into Earth’s future, and we do the maths on wormholes, to see if they offer a possible portal to our past.

On 8 May 2018, the United States withdrew from the Joint Comprehensive Plan of Action - a nuclear deal between Iran, the US and other countries. Since then, tensions between Iran and the US have escalated to the point where some believe a conflict is imminent. Kavita Puri and experts try to work out how the two countries got to this point, asking: is the US heading for War with Iran?

Presenter: Kavita Puri Producer: Chloe Hadjimatheou and Lizzy McNeill

(image: the Abraham Lincoln Carrier Strike Group has been deployed to the Red Sea. Credit: Michael Singley, U.S. Navy/Getty Images)

Indonesia has announced it is thinking of building a new capital city, moving the government away from Jakarta which is overcrowded and suffering from subsidence. Other countries, including Brazil, Kazakhstan, Russia and Tanzania have previously moved their capital cities, so just how difficult is the process, and can Indonesia learn from their mistakes?

(Photo: Jakarta's expanding skyline. Credit: Gerhard Joren/Getty Images)

It's a multi-billion dollar industry, with bands selling out stadiums across the world. K-Pop, or Korean Pop has created some of the biggest global music stars. How did bands, singing in Korean come to such prominence? The Korean government has capitalised on the soft power that its music industry has offered. But with the latest scandals involving the rape and abuse of women is there a darker side to it all? And could it tarnish brand Korea?

Photo: BTS performs 'DNA' onstage Credit: Getty Images/Michael Tran/FilmMagic

After months of protests, the Sudanese president, Omar al-Bashir was removed from office on 11th April by a military coup. Initially there were celebrations, but weeks later, with no clear plan for the military to hand over power to a civilian government many in the country are starting to worry whether their victory has been lost. So is the country heading towards democracy or another autocratic regime?

Photo: Sudanese protesters wave national flags near the military headquarters, Khartoum, April 2019. Credit: ASHRAF SHAZLY/AFP/Getty Images

In 2007, Ecuador decided to recognise some of its street gangs as cultural and social organisations.

Since then its murder rate has fallen sharply. Can inclusion policies turn gang membership into a force for good?

Presenter: Ruth Alexander Producer: Jordan Dunbar and Bethan Head

(Photo: Members of the Latin Kings gang pose for photographs and throw up their gang sign, New York. Credit: Andrew Lichtenstein/Corbis/Getty Images)

The world’s population is set to grow from 7.7 to 11 billion by the end of this century. The challenge is to produce enough food to feed this number of people. In the 1960s the Green Revolution provided answers to similar problems – but the projected population growth of the future is on a much greater scale than before, and so new measures are required. In east Africa they’re working to reduce the amount of food that’s lost before it even gets to market – globally this stands at around 30 per cent. In the United States scientists are working to improve the natural process of photosynthesis – to make plants themselves function more efficiently. And in India they’re working to preserve genetic diversity – conserving rice varieties that can flourish in salt water or in conditions of drought.

Who benefits from our fear and is there more than just global reporting behind it? Has the world become more dangerous or has our perception of the world just changed? Rolling news and social media makes us aware of every threat no matter where in the world.

From Ebola to flying we investigate the deeper reasons behind our modern fears. Speaking with experts in public health, risk and fear to find out why we are all so afraid.

This week The Inquiry asks ‘How Scared Should We Be?’

Presenter: Ruth Alexander Producer: Jordan Dunbar

Picture: American Wildfire Credit: Getty Images

In February a bomb blast killed at least 40 Indian paramilitary police officers in Kashmir; the worst attack by Pakistani militants in years. Indian military jets were deployed and one was shot down. As concerns over the pilot’s fate grew, fears mounted that India and Pakistan might go to war over Kashmir – again. The countries have been at war four times since partition in 1947. And Kashmir, which both countries claim in entirety but each one controls only in part, has been a key factor in the conflicts. But even when there is no war, there is no stable peace in Kashmir. Violent protests and street fighting are commonplace and daily life is made hard in numerous other ways. Unemployment is high, communication blackouts frequent and security fears constant. The Inquiry explores why the crisis has been so difficult to solve and what it might take for a resolution to emerge.

Presenter: Ruth Alexander Producer: Rosamund Jones

Picture: Displaced Kashmiris take shelter in a government school Credit: Getty Images

Life expectancy is going up as we develop new cures for the diseases that kill us off. But can we beat the most fatal condition of all - old age? We talk to scientists on the frontier of fighting the ageing process itself, when our bodies just start to wear out. In India, Tuhin Bhowmick is working towards 3D printing new organs so people don’t die waiting for transplants. In the US, Meng Wang is developing ways to use the tiny creatures that live in our guts to extend our lives. And in the UK, Lorna Harries and her team have made an amazing discovery that could let us roll back the ageing process in our own cells.

But is there an upper limit to the human life span? With all these advances racing ahead we ask – how long can humans live?

Contributors include:

Kaare Christensen - Head of the Danish Ageing Research Centre Tuhin Bhowmick - Director of Pandorum Technologies Meng Wang - Huffington Center on Aging at the Baylor College of Medicine Lorna Harries - Professor of Molecular Genetics, University of Exeter

Presenter: Helena Merriman Producer: Beth Sagar-Fenton

(An old woman with prayer wheels laughing at the Kyichu Buddhist Temple in Bhutan. Photo Credt: Tim Graham/Getty Images)

Many nations have now entered the space race. China first sent a man into space in 2003 and in the last few months made a successful, unmanned, landing on the far side of the moon. This was a world first. India has its own record. A few years ago it launched more satellites into space, in one go, than any other nation. Nigeria is talking about sending an astronaut into space. And Kyrgyzstan is developing its first satellite, built entirely by female engineers. The Inquiry explores what lies behind all this activity. Is the power of national prestige giving way to different goals; education, economic progress and human rights?

Presenter: Kavita Puri Producer: Rosamund Jones

This programme was originally broadcast on March 28th 2019.

Image Credit: Getty Creative

In recent years, in trouble spots and war zones around the world – places such as Syria, Eastern Ukraine and Central African Republic – The Wagner Group has been active. They are fighters for hire. But very little else, for certain, is known about them. Are they mercenaries working for the Russian intelligence service? Or are they muscle men securing the financial interests of powerful oligarchs? The Inquiry traces the history of the group; why they emerged and how they operate now. It is a story that twists and turns and leads to surprising – and dangerous - places.

Presenter: Kavita Puri Producer: Jordan Dunbar

Picture Credit: Valentin SprinchakTASS via Getty Images