Thank you for downloading this program from BBC Radio 4. I'm Tim Harford.

Hello and welcome to more or less, your friendly guides to the numbers that surround us every day.

This week we ask how maths helped win the Second World War.

We discuss the benefits of the chocolate bar diet and yet another vaccine scare story.

We have a tool that can prevent cancer.

How cool is that?

And to not be careful with how you're talking about that

is concerning to me.

But first, the storm surrounding corruption at FIFA shows no signs of blowing over,

and campaigners are hoping the next scalp will be the Football World Cup hosted by Qatar in 2022. Conditions for some migrant workers in

Qatar are appalling. Journalists from the BBC and other outlets have witnessed men working long hours for low pay in the blazing

heat and living in squalid dorm rooms.

The authorities in Qatar are clearly worried about stories like this getting out.

A B B.C. team was arrested whilst trying to report

on conditions there just last month. But if reports such as this one from Channel 4

News are to be believed, the conditions in Qatar aren't just bad, they're deadly.

The London 2012 Olympics cost the life of one worker.

South Africa's 2010 World Cup, two Beijing Olympics in 2008, six.

The Sochi Winter Olympics last year 60 and then there is Qatar where so far at least 1,200 workers have been killed.

That is 62 dead for every game in22 and counting.

Loyal listeners David True, Ross Harper, Dan Norman, Paul Orton and Drew Chilton were among many

to get in touch to ask if this figure is right. Well the man who's been giving it the

...