The other day I was sitting in my neighborhood Starbucks surrounded by the chatter of conversation and people hunched over their laptops or newspapers.

At one table, however, something remarkable was going on. A woman was sitting in an armchair, her laptop perched on a table in front of her. She was having an exuberant conversation — in sign language.

Not a sound came from her except for an occasional guffaw, but her conversation was so animated you almost felt you could hear it.

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