It was shortly after 5pm local time Tuesday when the sitting president of Africa's most populous nation picked up the phone to concede defeat. Goodluck Jonathan has congratulated one-time military strongman Muhammadu Buhari who, 30 years on, will be returning to the the presidential palace in civilian clothes. We look at the reasons why voters picked Buhari, and also why this election went so right; there were no protracted disputes, no post-electoral bloodletting. So, what's Buhari's plan?