(Disclaimer: this post has nothing to do with my life as a teacher)
Two things got my attention:
This will protect you from thieves trying to chop off your finger when they mug you for your phone.
The 5s sensor only works on live fingers. Nice. I guess the joke I made a few days ago isn’t something to worry about then…
But also: (emphasis mine)
Does fingerprint recognition work for everyone? No: guitar players, professional chefs, people who work in dry cleaners and chemical plants, and people in jobs that damage their fingertips will have problems.