Start the Week - Britain Divided: 1642-2016

On Start the Week Andrew Marr discusses the future of politics with David Goodhart and Oliver Letwin MP. In his latest book Goodhart looks at the fractious state of the west and the rise of populism, while Oliver Letwin asks what the government can do to reach those who feel marginalised.

The playwright Richard Bean reaches back to another time of internal conflict, the beginning of the English Civil War, and finds humour in the desperate attempts of one man to retain power.

Machiavelli is always associated with unscrupulous scheming, but his latest biographer Erica Benner argues that he was a man devoted to political and human freedom.

Producer: Katy Hickman

IMAGE: Rowan Polonski as Prince Rupert and Martin Barrass as Mayor Barnard in The Hypocrite by Richard Bean, a Hull Truck, Hull 2017 and RSC co-production. Photograph by Duncan Lomax (c) RSC.

Start the Week - Britain Divided: 1642-2016

On Start the Week Andrew Marr discusses the future of politics with David Goodhart and Oliver Letwin MP. In his latest book Goodhart looks at the fractious state of the west and the rise of populism, while Oliver Letwin asks what the government can do to reach those who feel marginalised.

The playwright Richard Bean reaches back to another time of internal conflict, the beginning of the English Civil War, and finds humour in the desperate attempts of one man to retain power.

Machiavelli is always associated with unscrupulous scheming, but his latest biographer Erica Benner argues that he was a man devoted to political and human freedom.

Producer: Katy Hickman

IMAGE: Rowan Polonski as Prince Rupert and Martin Barrass as Mayor Barnard in The Hypocrite by Richard Bean, a Hull Truck, Hull 2017 and RSC co-production. Photograph by Duncan Lomax (c) RSC.

Crimetown - S1 E12: Mob Justice

A mob lawyer rises to become Chief Justice of the Rhode Island Supreme Court. He promises to leave his past associations behind. But it's hard to part with old friends.

For more information about this episode, and a full list of credits, visit crimetownshow.com

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50 Things That Made the Modern Economy - Public Key Cryptography

Take a very large prime number – one that is not divisible by anything other than itself. Then take another. Multiply them together. That is simple enough, and it gives you a very, very large “semi-prime” number. That is a number that is divisible only by two prime numbers. Now challenge someone else to take that semi-prime number, and figure out which two prime numbers were multiplied together to produce it. That, it turns out, is exceptionally hard. Some mathematics are a lot easier to perform in one direction than another. Public key cryptography works by exploiting this difference. And without it we would not have the internet as we know it. Tim Harford tells the story of public key cryptography – and the battle between the geeks who developed it, and the government which tried to control it. (Photo: Encryption algorithms. Credit: Shutterstock)