Deaf professor carries smiles across the Pacific

Chinese Sign Language expert Zheng Xuan became the first hearing-impaired teacher to volunteer abroad with Confucius Institute

An educator who became the first deaf person to receive a PhD from a Chinese university has broken new ground with her volunteer work abroad.

Zheng Xuan, 35, works in a "Confucius classroom" at the Metro Deaf School in Saint Paul, Minnesota, the United States.