Fons Vermeulen/Shutterstock
Why aren’t humans covered in hair like other primates are?
Charles Joynson,
Rayleigh, Essex, UK
Andy Wasley/Shutterstock
How did Roman road builders know which way to go? If they were a few degrees out setting off from, say, Chichester, they could have ended up in what is now Slough, not London.
Derek Peters,
Waddesdon, Buckinghamshire, UK
To answer this question – or ask a new one – email lastword@newscientist.com.
Questions should be scientific enquiries about everyday phenomena, and both questions and answers should be concise. We reserve the right to edit items for clarity and style. Please include a postal address, daytime…
