Google Glass: what you can and can't do with it.

Google Glass: What You Can and Can't Do With Google's Wearable Computer
Some people whisper, "I think that's Google Glass." Others stop and ask, "How do you like it? How does it even work?" And then some just pull out their phones and snap a picture.

On the front, you have that star of the show -- a small little glass square. That's the screen, and when you put the glasses on you can adjust them so that it sits slightly above the top of your right eye. If worn right it really doesn't obscure your line of vision. No, I haven't been walking into walls. In fact, when I picked up my Glass, a Google employee (or Glass Guide) fit me for them and showed me how to slightly glance up to see the screen. You can also adjust or swivel that screen when you have it on to bring it closer in or out from your eye.

And your voice is one of the two modes of controlling Glass. You can navigate the screen either through voice commands or by using the trackpad on the right arm of the glass. That entire arm is touch-sensitive: sliding your finger on it allows you to move through the Glass interface and tapping once on it lets you make selections.