Author: BBC Radio 4

As global leaders remain divided on whether to carry out a military strike against Syria in response to the apparent use of chemical weapons against its people, Tim Harford looks at the different claims made about how many people have been killed. And, apparently, it's a fact that if there's one thing that's worse for you than drinking, scoffing bacon sandwiches and smoking 80 unfiltered cigarettes a day, it's being left-handed. Left-handers die on average several years earlier than right-handers. Or do they? Tim gets to the bottom of a sinister statistic. This edition was first broadcast on the BBC World Service.

Tim Harford looks at the different claims made about how many people have been killed in the apparent chemical attack in Syria. The cost of care has forced a million families to sell their homes in the past five years, it?s been reported ? but is it true? What can statistics tell us about the safety of Super Puma helicopters? Tim finds out whether left-handers really die nine years earlier than right-handers. And, he assesses the facts behind the claim that 300,000 attempts have been made to access pornographic websites at Parliament in a year.

Is it true that environmental problems will create 200 million migrants? Some politicians and environmentalists warn that this is the case. But migration experts say that the numbers are exaggerated. Tim Harford and Hannah Barnes investigate. This programme was first broadcast on the BBC World Service.

Has the government taken into account the worth of a badger's life in any cost-benefit analysis of the badger cull? It aims to kill 70% of badgers in the two cull zones, but Tim Harford discovers that such precision might be tricky. Plus, have blundering doctors and nurses really killed 13,000 patients in England? Shadow immigration minister Chris Bryant has warned that climate change is going to create 200 million more migrants but, More or Less discovers, migration experts disagree. And, always down with the cool kids, Tim discovers more about this buzz phrase, "big data". Might it be telling the world our darkest secrets?

People who drink more than 4 cups of coffee increase their chances of dying by 50%, it was reported recently. Given everyone?s chance of dying is already 100%, this seems a puzzle. What does the research really say, and how reliable are the findings? Plus, Ruth Alexander interviews economist and Expecting Better author Emily Oster, who used her statistical training to assess the evidence for herself on what effect coffee, alcohol and certain foods have on pregnant women. This programme was first broadcast on the BBC World Service.

Tim Harford speaks to Persi Diaconis, top professor of maths and statistics and legendary magician. The Stanford University professor and co-author of the book "Magical Mathematics" has an enthralling story to tell of how he discovered magic as a boy, and then, as a consequence, a love of maths. And to illustrate how closely maths and magic are linked, Crossing Continents editor and the BBC's in-house magician, Hugh Levinson, performs a mathemagical card trick - see the performance below. This programme was broadcast on the BBC World Service. The interview was recorded in 2011.

If all the world?s population crowded together, where could we all fit? London? Texas? More or Less figures it out, and separates fact from fiction. And, as the soccer season returns, is it possible to measure the effectiveness of a team?s manager? We hear from David Sally, author of The Numbers Game. This programme was first broadcast on the BBC World Service.

This week we find out what the most visited country in the world is and ask why aren?t they capitalising financially as well as their rivals. Plus we also investigate the complex - and often controversial - web of international extradition treaties. The programme hears from extradition lawyer Anand Doobay, from Peters and Peters, and Ted Bromund, a senior research fellow in Anglo-American relations in Washington DC. This programme was first broadcast on the BBC World Service.

The winner of this year's Tour de France, British rider Chris Froome, faced numerous questions about doping during the course of his victory. More or Less assesses his performance stats, and asks whether maths can measure whether cycling really has cleaned up its act and whether Froome is simply a victim of the ghosts of cycling's past. Dr Ross Tucker from The Science of Sport website gives us his views and we hear from physiologist Fred Grappe - the only man to see Froome's tour data. This programme was first broadcast on the BBC World Service.

It?s claimed that Egyptians have taken part in the biggest uprising the world has ever seen. The nationwide demonstrations, which were followed by the removal of the president by the army, were certainly a massive show of people power. But were the crowds really as large as reported? Ruth Alexander assesses the evidence, and finds out why it is so difficult to count a crowd. This programme was first broadcast on the BBC World Service.