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Bridget Kendall discusses the incredibly varied uses and meanings of crystals with cave scientist Penny Boston, who studies ancient life forms trapped inside the earth’s largest crystals, biophysicist Elspeth Garman who spends years growing one perfect protein crystal in her lab, and artist Roger Hiorns, who encrusted an entire apartment with bright blue crystals. (Photo: Liberata; taken by Giovanni Badino © SpeleoResearch&Film-LaVenta-C/Producciones)