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Our species has existed for about 300,000 years, and for all but the last 5,000 of them, people had to record and transmit vital knowledge without the aid of writing. At the Moon Dreaming site in the Northern Territory of Australia, Yidumduma Bill Harney, an elder of the Aboriginal Wardaman people, explains how Aboriginal culture has been transmitted down the generations orally, without the need to write anything down.