3 ms·
This video from 2013 references to possible methods: imperceptible changes in skin color and imperceptible movement of the head. https://youtu.be/EhZXDgG9oSk ht
by raphaelrk 8y ago
This video from 2013 references to possible methods: imperceptible changes in skin color and imperceptible movement of the head. https://youtu.be/EhZXDgG9oSk https://youtu.be/EhZXDgG9oSk