The promise of startups is grand: take a game-changing idea, add tech-savvy friends, sprinkle it with investor money, stir for 18-hour days with Skittles and coffee, and what do you get? A business that changes the world? Rarely. In most cases, you get failure—hot, messy, often spectacular failure.  But what if there was a way to tell your startup was in trouble? What would happen then? It’s not an exaggeration