Cameroon's 92-year-old leader Paul Biya has been sworn in for another seven years as president in a ceremony at the country's parliament in Yaoundé. Biya won a controversial eighth term in a fiercely disputed election last month. He has been in power for 43 years, and addressed only one campaign rally before the election. The nonagenarian, the world's oldest head of state, won 54% of the vote, compared to the 35% of Issa Tchiroma Bakary, according to the official results. Tchiroma Bakary