In “The Invention of Lying,” everybody tells the truth, all the time, 24/7. People wear their emotions (and their intentions) on their sleeves. And as odd of a world as it is, it’s also a strangely comforting one. Want to know if your crush feels the same about you? Ask her. Actually, she’s more likely to notice your nervous flirtations and tell you outright before you get a chance to ask her. If you want to know anything, anything at all, you just have to ask, and you’ll never lose sleep over falsehoods because they don’t exist.