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¿ìè¶ÌÊÓƵ'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

2K18TC6 London, UK. 16th Sep, 2022. Shaikha Al Mazrou, Red Stack, 2022, Lawrie Shabibi - Frieze Sculpture, one of the largest outdoor exhibitions in London, including work by international artists in Regent's Park. Credit: Guy Bell/Alamy Live News

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What is it about human physiology that leads us to use pillows?

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Gold jewelry with space for writing; Shutterstock ID 735656746; purchase_order: -; job: -; client: -; other:

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Why do jewellery chains in a box become so tightly knotted together?

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(Original Caption) 7/5/1946-The roller coaster is a rough ride, but do they love it! This unposed photo was taken by the intrepid photographer from a front seat, as the car made a stomach-dropping descent. A companion clutched the camera while he clicked the shutter. ACME ROTO SERVICE FOR IMMEDIATE RELEASE BPA 2 #124

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Why do we scream in fear? part 2

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INDIA. Bangalore. 2016. Laughing Yoga workshop participant Rie Sakamoto

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This week’s new questions

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Issue no. 3579 published 24 January 2026

New Scientist issue 3579 cover
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