San Francisco-based Neapolitan-style pizzeria Mozzeria, one of few deaf-owned businesses in the U.S., is opening a location on H Street in Northeast D.C. Sept. 4, not far from Gallaudet University.

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So, you want to learn sign language on a budget. You could be motivated by a desire to understand deaf friends better, communicate with relatives who are hard of hearing, or express yourself after ...