The same company that monetizes everything you do online would like to switch on your camera. Google wants a look at your hands before it lets you through. The company’s newest reCAPTCHA check, rolling out now as a test, asks you to switch on your camera and wave at it so an algorithm can decide whether you’re a human or a bot. That wave is less casual than it looks. The system records a short video of your hand and pulls 21 hand-landmark coordinates from it, mapping your finger joints, your pal...