Mental Mathematics

Research shows that people often wildly misunderstand the state of the world, regardless of age, sex, or education. And though the internet brings us unprecedented access to information, there's little evidence we're any better informed because of it. We may blame cognitive bias or fake news, but neither tells the complete story. Bobby Duffy draws on his research into public perception, offering a sweeping account of the stubborn problem of human delusion: how society breeds it, why it will never go away, and what our misperceptions say about what we really believe.

How many hours of sleep did you get last week? How many steps did you walk today? How many friends do you have? It seems everywhere you go, you’re surrounded by numbers. You depend on them, so you think they’re dependable, neutral, exact. But the truth? Numbers lie. They mislead. They’re tricky, little manipulative devils. And they’re in the process of really messing things up for you. You just don’t know it yet.