Communication without truth rings hollow. Social, political and commercial life without trust seems impossible. Human life without sex has been idealized in the past; some people idealize it now. Maybe it’s the wave of the future.

Post-truth, post-trust, post-sex. Older people who grew up in a different world will find this disconcerting. Young people may wonder why. They breathe the “post”-air of a “post”-world.

2016 was a turning point — Oxford English Dictionary named “post-truth” its word of the year. “Post-truth,” it said, “has gone from being a peripheral term to being a mainstay in political commentary.”