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Yes, taking pictures and recording videos are two of the biggest uses of Google glass. I think disclosure is going to be the issue, while you do have to speak to it, does it have a light to show others around you that you are, indeed, filming.  "Once you wake up Google Glass, you see the time (in rather large type) and "Okay Glass" right underneath it. That's your control command. I found that I could yell or whisper this and Google Glass sprang into action. It did have trouble in some noisy areas, but most of the time, I could get Glass' attention and then get something done. The two most obvious options, and the ones you'll likely use the most, are "Take a picture" and "Record a video." The former captures a relatively sharp 5-megapixel image. The second grabs just 10 second of 720 p video (that's the default; you can change it in settings). You can see some of the video I captured with Google Glass below."