[cortesoft]

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

[seandougall]

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

[cortesoft]

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

[brewdad]

Would holding your finger upside down on the scanner work?

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