Mary Beard

Psychologist Tania Lombrozo considers two books: In one, we learn what ancient Greece can tell us about Twitter trolls and, in the other, we're shown a world in which women have power over men.

The BBC children's film starred a black Roman soldier in ancient Britannia. Was it an accurate portrayal of a multi-ethnic empire or an "incredibly deceptive" anachronism? The dustup has lasted weeks.