"Current systems which verify if an internet user is a human or a robot often utilize images of visually altered text, a series of photos which a user must select from based on a prompt, or a puzzle piece which must be placed in the right spot. Google is now testing a system which will require internet users to record video of their hand."“Google is testing a new reCAPTCHA method that asks users to perform simple hand gestures on camera. The service is part of Google Cloud Fraud Defense,” Biometric Update said Monday. “The biometric verification system analyzes short video clips of a user’s hand and extracts 21 knuckle‑point coordinates to determine human liveness. The approach reflects trends toward using anatomical or behavioral cues to distinguish humans from bots.” FULL STORY at above link.