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More about this programme: http://www.bbc.co.uk/programmes/b01p39dwA few hundred years ago, extinction as a concept made no sense to anyone. But then fossil finds and advances in geology showed that it's part of life, and a statistical certainty - even for human beings.Find out more at bbc.co.uk/scienceclubVoiced by Helen McCrory, animated by 12Foot6.