More or Less: Behind the Stats - WS More or Less: Swimming World Records

World Records are being set at a much faster rate in swimming than in other sports. At the Rio Olympics, British swimmer Adam Peaty managed to break the men's 100m breaststroke world record twice in two days. Tim Harford speaks to swimming coach, Rick Madge, about the reasons swimmers keep getting better results in the pool.

Also, science writer Christie Aschwanden makes the case for the virtues of the 5,000 metre race. She says that in recent times it has become very popular for people to train to run a marathon. But when you look at the numbers, is the 5K a better distance?

Presenter: Tim Harford Producer: Charlotte McDonald

More or Less: Behind the Stats - Grammar Schools

It has been reported that Prime Minister Theresa May is planning on lifting the ban on creating new grammar schools. Chris Cook, Policy Editor for Newsnight, has been looking at the evidence for whether these selective schools improve exam performance or social mobility.

Swimming World Records New world records are being set in swimming at a much faster rate than other sports ? but why? Tim Harford speaks to swim coach and blogger, Rick Madge about the reason swimmers keep getting better results in the pool. Why do other sports, like athletics, not seem to have the same continual improvements in results?

Teenage girls aren?t so bad after all This week?s Desk of Good News challenges the concept that teenage girls and young women are badly behaved. It features statistics on falling teenage pregnancy rates, drinking figures and improving educational success.

The rise of TV Was the Queen's Coronation the event that sparked the biggest rise in TV sales ever? We take a look at the rise of television in the UK.

Lottery wins Adam Kucharski, author of The Perfect Bet, looks at the maths behind playing the lottery or gambling.

Presenter: Tim Harford Producer: Charlotte McDonald

More or Less: Behind the Stats - WS More or Less: Predicting Olympic Medals

How can we use statistics to predict how many medals each nation will win? We speak to Dr Julia Bredtmann, an economist at the RWI Leibniz Institute for Economic Research. She has come up with a model to predict how many medals each country will win, along with her colleagues, Sebastian Otten, also from the Leibniz Institute, and Carsten Crede of the University of East Anglia.

Some countries like the US and China have a large population and GDP, but a number of countries do very well for their size and wealth. Julia explains the different factors you have to consider to predict Olympic success.

More or Less: Behind the Stats - Plastic Bags

The Government says that since the introduction of the 5p fee for single use plastic bags their use has plummeted. We take a look at the numbers.

Olympic Medals at Rio 2016 The Olympic Games are with us again. So how can we use statistics to predict how many medals each nation will win? We speak to Dr Julia Bredtmann, an economist at the Leibniz Institute for Economic Research.

Income inequality Politicians and commentators often claim that the rich are getting richer while the poor are getting poorer. But what do the numbers actually tell us about income inequality in the UK? Tim Harford interviews Jonathan Cribb of the Institute for Fiscal Studies, the co- author of a comprehensive analysis of Living Standards, Income Inequality and Poverty in the UK.

Desk of Good News ? Maternal mortality rates The number of women dying in childbirth is falling around the world. In 1990, maternal mortality rates were 385 deaths per 100,000 live births Today there are 216 deaths per 100,000 live births. This means the death rate is down by nearly half.

The Coastline Paradox Why is it so difficult to measure coastlines? The further you zoom into the detail of a coastline, the longer it becomes. This is referred to as ?The Coastline Paradox?. We speak to Mairi Walker, a mathematician at the University of Edinburgh, and Danny Hyam, from The Ordnance Survey - the UK government agency responsible for mapping our coastlines.