Johannesburg, South Africa
President of South Africa gestures as he arrives for the 16th Nelson Mandela annual lecture, delivered...
President of South Africa gestures as he arrives for the 16th Nelson Mandela annual lecture, delivered by former U.S. President Barack Obama, marking the centenary of the anti-apartheid leader's birth, in Johannesburg, South Africa July 17, 2018. REUTERS/Siphiwe Sibeko