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There is a tiny user guide included in the box for additional questions. But in true Google fashion, some of the answers are serious...and some are tongue-in-cheek.
For example, the Q&A pamphlet acknowledges that not everyone should use Glass (i.e. some people might experience eye strain and/or headaches), but it also answers the obligatoroy question: "Is it OK to go scuba diving with Glass?"
As you might have expected, the answer is, "Uhhh... no."
For reference, the Glass team said that the headset is somewhat water-resistant (there are bound to be tears when sharing some of those priceless memories recorded with Glass, right?), but liquids could also seep in and lead to corrosion.