Watch your diplomatic language! Plus, Yang Ying's musical dialects

Should diplomats learn the languages of the countries they're assigned to? Diplomat Sherard Cowper-Coles and translator David Bellos say yes...but try to avoid foreign faux pas. Also, teaching in two languages in a US state where bilingual education is banned. Plus, the children of Pakistan's Sindh province are learning Chinese, while a Chinese classical musician is learning rock and jazz.