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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

MB9M93 Monster Truck Jumping Mid Air

Last Word

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

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Leopard gecko lizards on the rock, cute lizards that are easy to care for, eublepharis macularius, animal closeup; Shutterstock ID 2551815383; purchase_order: -; job: -; client: -; other: -

Last Word

Which animals can recognise individual people? Part 3

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BG2B51 Back of man wearing a set of large false ears for a joke

Last Word

What part do my ears or auditory system play when I think of a tune?

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3BHN5M7 A woman holds a sign that reads Greed is not a virtue during a protest across the street from Florida Congresswoman Maria Elvira Salazar's Office.

Last Word

This week’s new questions

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Issue no. 3572 published 6 December 2025

New Scientist issue 3572 cover
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