It’s not in the eyes, the face, or fingerprints. For some researchers, the future of biometrics lies in the ear.

Imagine walking into a store and instead of submitting to an iris scan, like in Minority Report, having the cameras scan your ear, noting its curves and wrinkles, to identify you. Christopher Mims, blogging for Technology Review, reports that that day may come.

What makes the human ear good for use as a biometric is its uniqueness, which does not change with age. But first the computer needs to be able to pick your ear out of the crowd, which–while easy for a human–is quite difficult for a computer...