91av

Last word

91av'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

Male nose close up bottom view - hair in the nostrils; Shutterstock ID 1895123341; purchase_order: -; job: -; client: -; other: -

Last Word

I see why we have two eyes and two ears – but why two nostrils? Part 2

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P2H56B Weasel standing upright, Mustela nivalis, Germany

Last Word

Why do many animals have white underbellies? Part 2

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Hand of male holding soil in the hands for planting. Expert hand of farmer checking soil health before growth a seed of vegetable or plant seedling. Gardening technical, Agriculture concept.; Shutterstock ID 2252590625; purchase_order: -; job: -; client: -; other: -

Last Word

How can I ensure that most of my body is used after my death?

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Piles of old tyres in a garage. Romania

Last Word

This week’s new questions

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Issue no. 3542 published 10 May 2025

91av issue 3542 cover
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