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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), ...

It’s best to solve this week’s puzzle (really, three mini-puzzles) without an introduction. I’ll explain why after you’ve given it a shot. Did you miss last week’s puzzle? Check it out here, and find ...

Many of us like to put our intelligence to the test, whether that's to keep ourselves sharp or if we just enjoy proving our mettle. There are many ways to do this, from doing crosswords or ...