Workers finish installing a billboard showing Kenya's President Uhuru Kenyatta and President Barack Obama in downtown Nairobi a day before Obama's visit. Ben Curtis/AP hide caption

itoggle caption Ben Curtis/AP

Kenyan graffiti artist Bankslave created a mural of Barack Obama. The president himself will visit Kenya on Friday. One of the president's agenda items is to promote solar power. Ben Curtis/AP hide caption

itoggle caption Ben Curtis/AP

A man in Nairobi, Kenya, stands in front of a mural of President Obama, created by the Kenyan graffiti artist Bankslave, ahead of Obama's trip to Kenya and Ethiopia. Ben Curtis/AP hide caption

itoggle caption Ben Curtis/AP

Traffic stands still in Nairobi. People in Kenya's capital don't like getting into cabs driven by strangers. They prefer to call drivers they know or who their friends recommend. Goran Tomasevic/Reuters/Landov hide caption

itoggle caption Goran Tomasevic/Reuters/Landov

Somali children dance in the Dadaab refugee camp in Kenya. Fairfax Media/Fairfax Media via Getty Images hide caption

itoggle caption Fairfax Media/Fairfax Media via Getty Images

At the "Dinner in the Dark" restaurant that's just opened in Nairobi, a blind waiter leads guests to their table. The photo was taken during a training session — that's why the lights are on. Courtesy of is Eatout.co.ke hide caption

itoggle caption Courtesy of is Eatout.co.ke

An ancient stone tool unearthed at the excavation site near Kenya's Lake Turkana. It's not just the shape and sharp edges that suggest it was deliberately crafted, the researchers say, but also the dozens of stone flakes next to it that were part of the same kit. MPK-WTAP hide caption

itoggle caption MPK-WTAP