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 ...

Do you tend to follow your gut when faced with a new problem? Or do you take a methodical approach? Reading time 3 minutes It’s best to solve this week’s puzzle (really, three mini-puzzles) without an ...