If you stop smiling at any moment during the clip, the camera registers it and the video cuts off. The pause video only continues once you put a smile back on your face. Crack and hold a smile and ...

Smile Down the Runway is based on a manga ... in a believably-pretty way and allows her to be beautiful without the camera ever seeming like it's leering at her or the other models.

It can anticipate whether someone will smile about 0.9 seconds before they do, and smile itself in sync. “I’m a jaded roboticist, but I smile back at ... faces on a live camera feed.