People often make fun of the fact that no one can recognize Superman when he puts on his glasses and becomes Clark Kent. It’s just a pair of glasses, right? Not according to this study, which actually tested whether glasses interfere with people’s ability to match two identical faces. The result? Glasses are actually a pretty good disguise, causing subjects to think the same face with and without glasses was two different people. It’s a bird! It’s a plane! It’s… science!