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Protests have spread across the United States over the last few weeks. The protestors have been registering their feelings about incidents where police have shot and killed black men. High profile recent incidents resulted in the deaths of Alton Sterling and Philando Castle, and the protestors feel that minorities are being disproportionately targeted by the police.

On top of this, at a recent protest in Dallas a gunman shot and killed five police officers.

But what can the numbers tell us about the issue? How many people do police officers kill each year in the USA? And how many police officers are killed? Tim Harford investigates.

Producers: Charlotte McDonald, Elizabeth Cassin

It’s often said that we should all be aiming to get eight hours of sleep a night. But could it actually lead you to an early grave? Research shows that sleeping for longer, or shorter, than average is associated with an increased risk of disease and mortality. But what’s causing the health problems, and should you really give up the lie-in? Ruth Alexander looks at the latest sleep science with Dr Gregg Jacobs from UMASS Medical Center, US; Professor Franco Cappuccio from Warwick University, UK; Professor Jim Horne of Loughborough University, UK; and Professor Shawn Youngstedt of Arizona State University, US.

*Please note this is a repeat from February 2015*

(Photo: Man asleep in a bed. Credit: Corbis)

Is Iceland the best football team in the world per capita? England suffered a 2-1 defeat to Iceland in the European Football Championship in France. This was embarrassing for England when you consider its population is 163 times bigger than Iceland’s. We take a look at whether Iceland is now the best performing football team in the world if you compare UEFA ranking to the size of each country’s population. Plus, we take a look at the chances of a young man in Iceland and in England getting to represent their country on the pitch.

Old versus young Brexit voters

Many media outlets have reported that it was predominantly the older generations in the UK who voted to ‘Leave’ the EU in a recent referendum, while those under 25 were keenest to ‘Remain’. It has prompted many listeners to ask whether a referendum on this topic might yield a different result if held in a few years’ time as the electorate changes. We attempt some back of the envelope calculations with Tom Chivers from Buzzfeed. But actually – how good is the data available? How do we know how people voted or how they would vote in the future?

Following a referendum, the UK has voted to leave the European Union. Tim Harford and the team explore what that might mean for the UK’s economy. Most notably - what might be the impact on trade? We examine the economic forecasts from the government, and how the UK might manage its relationships with other countries.

(Image: A pay-per-view binocular with the British and European Union flags. Credit: Sean Gallup/Getty Images)

How are companies using our personal data? It’s a familiar concern. Online retailers are tracking us so they can sell things to us. Bricks and mortar retailers have loyalty card schemes. Our banks and credit card companies know all about us. And of course, the big computer and telecoms companies could potentially track our internet searches, our phone calls – even our location as we wander around. But this isn’t the first time that large corporations have gathered sensitive data about their customers. We tell the shadowy story of how the personal details of Americans were pooled among insurance companies more than a hundred years ago.

If it seems the EU referendum debate just involves two politicians shouting contradictory statistics at each other - then we are here to help. In this series, we're giving you a break from the politicians and we're going to try to figure out the truth. Bracing concept, isn't it? We'll be looking at some of the big questions - the cost of being a member, immigration, lawmaking and regulation. But today we're looking at trade. Tim Harford asks if the UK would be better off in or out when it comes to trade with other nations.

If it seems the EU referendum debate just involves two politicians shouting contradictory statistics at each other - then we are here to help. In this series, we're giving you a break from the politicians and we're going to try to figure out the truth. Bracing concept, isn't it? We'll be looking at some of the big questions - the cost of being a member, immigration, law-making and trade. But today we're looking at EU regulation. Tim Harford asks how much red tape from the EU is costs the UK and what might happen if we leave?

If it seems the EU referendum debate just involves two politicians shouting contradictory statistics at each other - then we are here to help. In this series, we're giving you a break from the politicians and we're going to try to figure out the truth. Bracing concept, isn't it? We'll be looking at some of the big questions - the cost of being a member, immigration, regulations and trade. But today we're looking at lawmaking. Tim Harford asks how much UK law comes from the EU and are we always being outvoted on what to implement?

If it seems the EU referendum debate just involves two politicians shouting contradictory statistics at each other - then we are here to help. In this series, we're giving you a break from the politicians and we're going to try to figure out the truth. Bracing concept, isn't it? We'll be looking at some of the big questions - The cost of the EU, lawmaking, regulations and trade. In th secomd of these programmes Tim Harford asks what might happen to migration if we left the EU, and what are the benefits and costs of EU migrants to the UK economy?

If the EU referendum debate just involves two politicians shouting contradictory statistics at each other - then we are here to help.