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The mysterious Inca code of knotted strings
500 years ago, the Incas ruled the western half of South America with the help of a unique form of writing based on coloured and knotted strings. Researchers think they're getting closer to deciphering these strings, known as khipus.
Guest: Professor Sabine Hyland, anthropologist from the University of St Andrews
Producer: Sarah Allely
Originally broadcast in June 2025.
The skinny
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