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Last word

¿ìè¶ÌÊÓƵ'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

In the Medical Laboratory, Anonymous Female Patient Lying on a CT or MRI Scan Bed Undergoes Scanning Procedure with Red Lasers. Advanced Healthcare Facility with High-Tech Equipment; Shutterstock ID 2587414477; purchase_order: -; job: -; client: -; other:

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Why are MRI machines so noisy and what stops us making them quieter?

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Will the ocean ever be too salty for life to thrive? Part 2

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Will the ocean ever be too salty for life to thrive? Part 2

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If all Earth’s water were put in a ball, how large would it be? Part 2

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2HR09CM Killer whale, Orcinus orca, spy hop, Vestfjord, Ofotfjord, and Tysfjord, Lofoten Islands, Norway, Atlantic Ocean

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This week’s new questions

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Issue no. 3581 published 7 February 2026

New Scientist issue 3581 cover
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