South Africa's African National Congress (ANC) is set to vote on who will succeed President Jacob Zuma as its leader.

Poor countries like Malawi are doing what they can to improve educational quality and access. But there is only so much that a country with modest means can achieve, which is why global leaders, when they meet in Senegal early next year, must recommit to investing in the education of all children.

Zimbabwe's former vice-president, whose sacking led to the shock resignation of long-time leader Robert Mugabe, will be sworn in as the new president on Friday, the state broadcaster says.

Zimbabwe's army chief has warned those responsible for "purging" the country's ruling Zanu-PF party to stop, or the military will step in.