Bridget Kendall discusses the incredibly varied uses and meanings of crystals with cave scientist Penny Boston, whose work takes her deep underground to study ancient life forms trapped inside the earth's largest crystals; biophysicist Elspeth Garman who, with the help of robots, can spend years growing one perfect protein crystal in her lab; and artist Roger Hiorns who has encrusted many objects with sparkling blue copper sulphate crystals, including the entire interior of a derelict London bedsit.

(Photo: Liberata; taken by Giovanni Badino © SpeleoResearch&Film-LaVenta-C/Producciones) Show less