Can the left rely on non-voters to get them into power? Should population density be used to decide how many refugees a country should take. Tim Harford looks at the numbers.

Can you rely on non-voters

During the election for the leadership of the Labour Party in the UK Jeremy Corbyn has whipped up unprecedented support among grass roots activists pushing him into a surprising lead. Bernie Sanders the left-wing Democratic candidate has done the same energised grass roots support in the United States in a similar way. Their supporters believe in both cases they can shake up the political mainstream and convince non-voters to turn out at the ballot box. But is this a wise strategy?

The latest on deaths for people admitted at a weekend?

Reports suggested 11,000 are dying in hospital after being admitted at the weekend but what does the report actually say?

Too dense

Is the UK already more densely populated than other places in Europe and is this a good argument against taking more refugees.

How many houses do we need?

We're told that we need to build 200,000+ houses a year to meet housing need in this country. We talk to Kate Barker the woman who first came up with this number about where it comes from and what it means.

How many bananas will kill you?

There's a belief among some people that too many bananas will kill you. Eat too many and you will overdose on potassium and die. But how many bananas would you need to eat?