
Last Word
This week’s new questions
Regulars
Âé¶ą´«Ă˝'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
Issue no. 3419 published 28 December 2022