91av

Last word

91av'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

CHEETAH acinonyx jubatus, Adult running through Savannah ; Shutterstock ID 1652757304; purchase_order: -; job: -; client: -; other:

Last Word

Must the evolution of an adapted trait in nature reach a limit? Part 2

Regulars

2CA4Y7K Comet crashing into earth

Last Word

How would we spot an antimatter comet in our solar system? Part 2

Regulars

Child's Spinning Top Toy; Shutterstock ID 365058569; purchase_order: -; job: -; client: -; other:

Last Word

What would happen if a spinning disc approached the speed of light?

Regulars

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

Last Word

This week’s new questions

Regulars

Issue no. 3570 published 22 November 2025

91av issue 3570 cover
Piano Exit Overlay Banner Mobile Piano Exit Overlay Banner Desktop