Billions of dollars are pouring into the latest investor craze - artificial intelligence. But serious scientists like Stephen Hawking have warned that full AI could spell the end of the human race. How seriously should we take the warnings that ever-smarter computers could turn on us? Our expert witnesses explain the threat, the opportunities and how we might avoid being turned into paperclips. (Photo: An artificial intelligence concept illustration. Credit: Shutterstock)

On 8 December at a summit in London Britain’s prime minister David Cameron told delegates from 50 countries and 26 tech firms that online child exploitation “existed on an almost industrial scale" around the world. He announced an “unprecedented package of global action” to hunt paedophiles who use the internet. And just weeks before that a committee of British politicians revealed their belief that the intelligence services could have stopped a May 2013 terror attack in London if Facebook had alerted the authorities to an online exchange between one of the attackers and another extremist. In this edition of The Inquiry we ask: Can the internet be policed?Presenter: Jo Fidgen(Photo: Big Data. Credit: Carlos Amarillo)

In November President Obama stepped onto a plush red carpet at the end of a White House corridor. “My fellow Americans,” he said, “tonight I want to talk to you about immigration.” He promised to bring change through executive action. “And to those members of Congress who question my authority to make our immigration system work better,” he said, “or question the wisdom of me acting where Congress has failed, I have one answer - pass a bill.” That was a dig at his Republican opponents who control the House of Representatives. They failed to pass a bill last year to reform immigration. But that night, after Mr Obama finished speaking, the Republican leader in the House had his own harsh words for the president: “That’s just not how our democracy works,” he said, “the president has said before that he’s not king. And he’s not an emperor. But he’s sure acting like one." With Republicans now in control of both the House and the Senate, the risk of continued political paralysis in Washington is very real. Many Americans are angry; turnout at the recent mid-term elections hit a 72-year low. Is American democracy broken?(Photo: American Flag. BBC copyright)

In the last six months the price of oil has collapsed dramatically. It has been called an oil shock. Previous oil shocks have had profound and long-lasting effects. No single commodity is more important to the global economy – and therefore to global politics. What are the political consequences of cheap oil? Contributors include an ex-president of Shell Oil, a former US energy secretary and one of the world’s leading thinkers on the subject. (Image: Oil rig in the North Sea. Credit: Press Association)

Swedish politics has for decades been the very model of stability. Not any longer. Earlier this month a far-right party which holds the balance of power in Sweden’s parliament sided with the opposition to defeat the government. A snap election has been called, just months after the government was formed. In Greece, where EU-imposed austerity has fuelled extreme politics, the radical left Syriza party could soon have a shot at gaining power. It is already the main opposition.Elsewhere in Europe – in France, Spain, Hungary, Italy and elsewhere – far right and hard left parties have gained popular support and parliamentary seats, threatening the political centre. Can Europe resist the rise of radical politics?(Photo: Shadow of Marine Le Pen. Credit: Jeff Pachoud/AFP/Getty Images)

How much do the Great Satan and the Axis of Evil have in common? Quite a bit, it turns out. They share a mutual antipathy towards Islamic State militants and a mutual desire for a stable Afghanistan. There has been cautious optimism in Washington and Tehran about the talks over Iran’s nuclear programme. And yet there is a legacy of hate and mistrust on both sides that goes back decades. How far can today’s leaders overcome the past to work together on common goals? We have answers from experts who travel back and forth between the two countries, including a former ayatollah.(Image: U.S. Secretary of State Kerry and Iranian FM Zarif shake hands - Reuters Wires)

Perhaps the most striking feature of the global financial crisis has been that no top banking executive has been successfully prosecuted for their role in bringing it about in the first place. The period covered by the statute of limitations is running out so it is conceivable none ever will. Yet the word 'fraud' appears 157 times in the final report of the US Financial Crisis Inquiry Commission. So why are we not seeing prosecutions and prison terms, as in previous financial scandals? Guests include a former prosecutor, a law professor, an economist and a recently-retired US Senator.(Image: Shutterstock - Val Lawless)

Mexico is gripped with the story of 43 student protesters who vanished in September. They were allegedly killed on the orders of a mayor who wanted to prevent them from attending a rally where his wife was due to speak. The mayor and his wife have been arrested but no case has been proven against them in court. The story has fuelled nationwide demonstrations about the relationship between government and organised crime. The government says it is taking the problem seriously and points to falling murder rates and the arrest of a number of drug barons in recent years, as evidence that Mexico is winning the war against the cartels. Guests include an investigative journalist who has had run-ins with the cartels, a former Mexican intelligence analyst who says he is obsessed with stopping the violence and a prominent public intellectual with a long view of the patterns of power in Mexico.

Vladimir Putin certainly knows how the West views his actions in Ukraine. Sanctions have been in place against Russia for months. There is talk of toughening them. At the G20 meeting in Australia he was rebuked by Angela Merkel, Stephen Harper and other leaders, before flying home early. But are sanctions having any real effect on the Russian president? Are they likely to force him to change course in Ukraine? We hear from a top Moscow economist Natalia Orlova, a Putin loyalist in Vladivostok, veteran European diplomat Sir Robert Cooper and Fyodor Lukyanov, editor of Russia in Global Affairs and a close Putin-watcher.(Photo: President Vladimir Putin. Credit: AP Photo/Darko Vojinovic)

Hong Kong's government is preparing to clear the streets after weeks of protest. The demonstrators want direct talks with Beijing over who gets on the ballot for the 2017 Hong Kong election. But there is more than politics at play. China has had almost a generation to win hearts and minds in Hong Kong - a time when the mainland population has become increasingly nationalistic. What has gone wrong in Hong Kong? Our four experts tell a story of snobbery, arrogance and perhaps unrealistic expectations on both sides. Helena Merriman presents.

Outbreaks are inevitable, pandemics are optional,” says Dr Larry Brilliant, a leading figure in the successful global campaign to eradicate smallpox.But does the flawed international response to the Ebola outbreak suggest it is now less likely that the world will come together to defeat diseases with pandemic potential?The Inquiry meets Dr Brilliant and other expert witnesses: Dr Malik Peiris, who identified SARS; Dr Julie Gerberding, president of the Vaccine division at Merck; and Ian Goldin, formerly of the World Bank.Presenter: Helena Merriman Producers: Charlotte Pritchard and Neal Razzell Editor: Richard Knight