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SUBSCRIBE to the OFFICIAL BBC YouTube channel: https://bit.ly/2IXqEInLAUNCH BBC iPlayer to access Live TV and Box Sets: https://bbc.in/2J18jYJProgramme website: http://bbc.in/1NjV0Cp David Attenborough introduces the perplexing world of glowing fungi and asks, is fungal bioluminescence just a biochemical accident or is there a more important function at play?
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