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In Bristol, in the south-west of England, motorbike theft is rife, and criminals use social media to brag about their exploits and even extort money from their victims. But some bikers, sick of losing their treasured possessions, have started to take matters into their own hands. They’ve formed a Facebook group to try to hunt down stolen motorbikes, but will they be successful?

What causes economies to grow and might this growth outstrip our planet’s capacity to sustain it? The new joint winners of the Nobel Memorial Prize in Economic Sciences, economists, William Nordhaus and Paul Romer, have enabled us to edge closer to an answer. Tim Harford joins Ruth Alexander to talk about how these economists’ works have challenged our perceptions of materialism, productivity and climate change.

Why do we keep open Secrets - when everybody knows something is going on but it is never officially acknowledged? Things are left unsaid, remaining in this strange unacknowledged state for decades. So why do some open secrets not come out sooner? Nastaran Tavakoli-Far looks at the Catholic church, the trading floor and to the wrestling ring for some answers.

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