Radio choice Charlotte Runcie

BBC World Hacks WORLD SERVICE, 3.06PM

Discarded chewing gum is a blight that costs councils millions of pounds every year to clean off our pavements. Happily, however, this edition of

BBC World Hacks tells the truly amazing story of the work of product designer Anna Bullus, who has thought of a solution to deal with the environmental eyesore. She has invented a way of extracting a polymer from used gum and recycling it into brand new plastic products, including pencils, reusable coffee cups, frisbees – as well as bins for used chewing gum, of course. The Art of Now: No Singing No Movement

RADIO 4, 11.30AM

What’s the music scene like in Sudan? And what was it like before Islamic rule? You might not ever have found yourself asking that question, but the answer is an interesting insight into the cultural history of the country, from the Fifties and Sixties where a rich jazz-influenced musical culture flourished in Khartoum, but when Sharia law was applied in the Eighties, music and public dancing were heavily curtailed. Today, however, some musical freedom is coming back, and some old bands have even re-formed.