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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

Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

Last Word

If all Earth’s water were put in a ball, how large would it be?

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MB9M93 Monster Truck Jumping Mid Air

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What are the pros and cons of using carbon dioxide in tyres? 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

This week’s new questions

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Disappointed woman packing for a journey: she is standing in front of her suitcase overfilled with clothes, travel and vacations concept; Shutterstock ID 2314449417; purchase_order: -; job: -; client: -; other:

Last Word

How do you get the most clothes into a suitcase? part 2

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cofee cup on the sand at the sunset; Shutterstock ID 1450632401; purchase_order: -; job: -; client: -; other:

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I'm in an arid desert with some caffeinated coffee. Should I drink it?

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Issue no. 3576 published 3 January 2026

New Scientist issue 3576 cover
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