The all-seeing Kinect: tracking my face, arms, body, and heart on the Xbox One

Kinect has always been able to tell that you're moving. But now it can tell if you're moving your thumb, and which way your thumb is facing. It can tell which muscles you're engaging at any given time, and how much — it knows the difference between a jab and an uppercut, and registers them differently. If you're playing with a friend, it can tell when the two of you switch places, or even when the two of you switch controllers. Kinect knows if you're smiling or frowning, or if you're talking or not. It knows if you're looking at the screen or not, and will only register your commands if you're looking. It knows, by either remarkable science or sorcery, your heart rate just by looking at your face.