The main problem with voice control is that you don't know who people are talking to when they talk in the air. That's why bluetooth headsets are considered awk

The main problem with voice control is that you don't know who people are talking to when they talk in the air. That's why bluetooth headsets are considered awkward while holding a cellphone to your ear is not. Glass would need a simple social cue, like touching the side of it to enter voice commands.