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Last word

New Scientist'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

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

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Why do we throw our heads back when experiencing different emotions?

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Close-up of a Cymbiola nobilis shell, also known as the noble volute, against a black background, featuring its distinctive zigzag patterns and smooth texture; Shutterstock ID 2637416271; purchase_order: -; job: -; client: -; other:

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How do sea molluscs create the consistent patterns on their shells?

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This week’s new questions

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This week’s new questions

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cinematic flight through dark deep space asteroid field with stars; Shutterstock ID 2687214359; purchase_order: -; job: -; client: -; other:

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If Earth exploded, how many rocks would have evidence of life? part 2

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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

Last Word

Why do we use pillows? part 3

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Issue no. 3583 published 21 February 2026

New Scientist issue 3583 cover
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