By now, if you’re interested in tech, you’ve probably seen a video or two of the iPhone X being unlocked by someone’s face that isn’t the owner. Apple said it was more secure than Touch ID, at least twice as secure, so what gives? There are a few factors at play here. It involves the machine learning Apple uses to make Face ID work, Face ID’s limitations on children, and, unfortunately, some really bad news for anyone with an identical twin (especially if they’re an evil twin). To answer your biggest question, no, Face ID isn’t easily compromised, but there are steps you may be unintentionally doing that are making you more vulnerable. Here’s an explanation of what’s happening, and how you can ensure your phone is secure.