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Yeah, and you can't rotate your fingerprints or retinal scans.

If you only train one fingerprint at a time, most people can rotate up to nine times. It's a bit inconvenient, though. :)

Yeah, but stealing a single glass could get all your future passwords.

Would holding your finger upside down on the scanner work?

(Nope. My Nexus 5X unlocks no matter the orientation of my finger)