From Our Own Correspondent

South Africa’s former president Jacob Zuma has been charged with a string of crimes including corruption, racketeering and money-laundering. He denies all allegations of wrongdoing and earlier this week didn’t attend his trial saying he was too sick. But photos posted on social media suggest otherwise and Andrew Harding says its South Africans who are really sick - sick of Zuma’s excuses. A self-described ''Asian man who's good at math”, Andrew Yang is a very long-shot for the White House. But self deprecating humour aside, the Chinese American entrepreneur and candidate for the Democratic party has lasted longer in the contest than many expected. He broke down in tears last week in Iowa, saying that campaigning for the last two years had been “the journey of my life.” Among the audience were some curious students from mainland China. Some 360,000 Chinese students now study in the US but what are they learning about the American way of voting, asked Zhaoyin Feng, the BBC’s Mandarin correspondent in Washington