> new knots, never before tied, were invented some ~100 years ago. No. I don't believe that. The archeological record has evidence of humans making rope for

> new knots, never before tied, were invented some ~100 years ago. No. I don't believe that. The archeological record has evidence of humans making rope for tens of thousands of years. I can believe that nobody alive had seen and named those particular interlocked pairs of overhand knots; that no written record of them existed until recently. But your claim that those knots had never been tied is quite presumptuous.