I’M BRITISH. Soon after moving to Switzerland, where I lived for six years, I threw a house-warming party and was taken aback when all 30 guests arrived exactly on time. Years later, having moved to France, I turned up at the appointed hour for a dinner, only to find that no other guest had arrived and my hostess was still in her bathrobe…

This article first appeared in New Scientist on 10 April 2018. To continue reading, click here (paywall).