Kenya's President Calls for Peaceful Election

President Uhuru Kenyatta attempts to defeat Raila Odinga and win a second term. Also, scientists warn that current systems of measuring greenhouse gas emissions are flawed. And a computer programme that can read emotions in text.

( Picture: Supporters of Kenyan opposition National Super Alliance (NASA) presidential candidate, Raila Odinga,at a rally on August 5th 2017 in Nairobi Credit: AFP / TONY KARUMBA)