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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

White hydrogen storage tanks with blue H2 labels, set against a blue sky with clouds, symbolizing clean energy. 3D Rendering; Shutterstock ID 2460820695; purchase_order: -; job: -; client: -; other: -

Last Word

Would using Earth's white hydrogen deplete our oxygen supply?

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JAPAN. Tokyo. Bank near Tokyo Station. 2002.

Last Word

How much money is gained or lost in computer rounding errors annually?

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2WA289F The supermoon rise at the Nature Discovery Sanctuary in Winkler, Manitoba, Canada.

Last Word

This week’s new questions

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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 ears – but why two nostrils? (Part 2)

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Issue no. 3545 published 31 May 2025

New Scientist issue 3545 cover
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