We profile the "mezzo-forte" company near Bielefeld in Germany which has found a way to get great sound quality out of instruments it makes out of carbon.
Musical people know: producing sound is possible with nearly anything. Musical instruments are made of all sorts of materials, for instance, from ice.
Building instruments for fancy space experiments is a tough job, but rewarding if your technology transfers to Earth. Dr Geraint Morgan went from compounds on a comet to sniffing bed bugs in hotels.
A panel of the world's most eminent economists have estimated how high carbon prices need to be for the world to avoid climate catastrophe - and put forward ideas on how to spend the money raised.
Music written in concentration camps is being performed on a violin played by German writer and Holocaust survivor Bruno Apitz at the Buchenwald concentration camp. It marks the violin's first performance in 72 years.
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