Curiosity is a double-edged sword. It can lead us to amazing intellectual achievement — Albert Einstein said his only “special talent” was being “passionately curious” — but it can also kill proverbial cats (R.I.P.). So … how exactly does this complex force work? In a new study, researchers from the UK and Japan found that curiosity works a lot like hunger. It’s basically the hunger for knowledge — and like hunger, it’s hard to ignore. Curiosity can make us risk physical pain, even when we’re curious about something pretty trivial.