
Last Word
Why do jewellery chains become so tightly knotted together? part 2
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¿ìè¶ÌÊÓÆµ's popular Last Word series gives readers the opportunity to answer each other's questions about everyday science phenomena, from the shape of scones to the evolutionary history of toenails. To answer a question or ask a new one, email lastword@newscientist.com

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Issue no. 3582 published 14 February 2026