Apple's brand-new iPhone 5S isn't dramatically different from last year's model, but it has at least one major addition: a "Touch ID" sensor. Us human beings are calling it a fingerprint sensor, and it's built into the phone's main Home button below the screen. Apple's Phil Schiller says, "It reads your fingerprint at an entirely new level" -- it's 170 microns in thickness with 500 ppi resolution. According to Cupertino, it "scans sub-epidermal skin layers," and can read 360 degrees. As expected, the sensor is actually part of
