Maybe you have a dark sense of humor, or perhaps you failed your driver’s test—both are signs of intelligence, according to science. But how smart are you, really? The Cognitive Reflection Test (CRT), ...

The world's shortest IQ test is just three questions long and can tell if you're smarter than 80 percent of the population. Called the Cognitive Reflection Test (CRT), it has been around since 2005 ...

Forbes contributors publish independent expert analyses and insights. I write about relationships, personality, and everyday psychology. Have you ever shouted out an answer to a seemingly simple ...