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Using Google Now, modeled after Apple's Siri, you can ask your glasses questions.
"OK, Glass, [question]."
Travelling abroad? Don't worry; your Google glasses will translate for you.
"OK, Glass, say [text] in [language]."
Google Glass will sometimes provide answers before you've had a chance to ask a question. It can take information from the internet and display it on your eyepiece.
The glasses will be able to identify people based on their clothes, eyeglasses, and other identifiable characteristics.