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So simple, a caveman can sew it...

Harvard researchers have found evidence in a Caucasus cave that around 34,000 years ago, humans not only made thread, but colored it. They found twisted threads that could have been used as ropes, and knotted threads that could have been used for sewing, along with threads that were colored for decoration. The threads were made from flax, which is used for linen, though there is no evidence that people were making fabric from it back then.

http://www.scientificamerican.com/podcast/episode.cfm?id=prehistoric-human-fashioned-fibers-09-09-11

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