Your Walk Betrays You

You have never walked anonymously. You may have believed otherwise, pulling a hood over your head or choosing the busy side of the street, but the truth has been catching up for years. The way you shift your weight from one foot to the other, the cadence of your stride, the particular rhythm of your fingers on a keyboard, even the micro-fluctuations in your voice when you order a coffee: all of these patterns are, increasingly, as identifiable as your fingerprint. And unlike your fingerprint, yo