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Road accidents are the single largest cause of death amongst young people around the world. But a project in Kenya is making impressive progress in tackling the issue. It has deployed a small and very simple weapon, which has been proven to cut bus accidents by at least a quarter – a sticker.

Also on the programme, how they’re making recreation space in Chile, but without knocking down any buildings.

Presenter: Tom Colls
Producer: Harriet Noble

[Image: Mutatu buses in Kenya. Copyright: Getty Images]