Tech Tent

Mobile phone buyers in China are made to provide facial recognition data when they get a new plan. But are Chinese citizens comfortable with the rapid rollout of such tech? Plus, how advances in machine learning could help patients with Parkinson's Disease manage their symptoms better. Presented by Rory Cellan-Jones, with BBC tech reporter Zoe Kleinman, and special guest Stephanie Hare, technology researcher.(Image: Customers buy food via facial recognition system In Hangzhou, China, Credit: Getty Images).