What’s so great about Google’s ‘translation glasses’?

Google teased translation glasses at last week’s Google I/O developer conference, holding out the promise that you can one day talk with someone speaking in a foreign language, and see the English translation in your glasses.

Company execs demonstrated the glasses in a video; it showed not only “closed captioning” — real-time text spelling out in the same language what another person is saying — but also translation to and from English and Mandarin or Spanish, enabling people speaking two different languages to carry on a conversation while also letting hearing-impaired users see what others are saying to them.

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