This 2013 photo shows the LD 350-1 mandible just steps from where it was found in Ethiopia. The jawbone fragment is the oldest known fossil from an evolutionary tree branch that eventually led to modern humans, scientists say. Kaye Reed/AP hide caption

itoggle caption Kaye Reed/AP

Three varieties of Kenyan purple tea from What-Cha: silver needle purple varietal white tea (from left), hand-rolled purple varietal oolong, steamed purple varietal green tea-style tea. Jeff Koehler for NPR hide caption

itoggle caption Jeff Koehler for NPR

How do siblings get around the "no touching" rule during the Ebola outbreak in Sierra Leone? Alex and Jen Tran grabbed a rare hug when they were geared up for training. Courtesy of Alex Tran hide caption

itoggle caption Courtesy of Alex Tran

Physicians Nowiba Mugambi and Erica Palys discuss a patient's X-ray at the Moi Teaching and Referral Hospital in Eldoret, Kenya. The hospital plans to open a new cancer treatment center in April. Evelyn Hockstein/Courtesy of AMPATH hide caption

itoggle caption Evelyn Hockstein/Courtesy of AMPATH

Vice President Joe Biden was criticized for coming up from behind and getting too close to Stephanie Carter at her husband's swearing-in ceremony as secretary of defense. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP

Customers wait to collect money at the Juba Express money transfer company in Mogadishu, Somalia, on Feb. 12. Mohamed Abdiwahab/AFP/Getty Images hide caption

itoggle caption Mohamed Abdiwahab/AFP/Getty Images

Relatives and supporters of Egyptian activist Alaa Abdel Fattah react after Monday's verdict in a trial over an illegal protest. Khaled Desouki/AFP/Getty Images hide caption

itoggle caption Khaled Desouki/AFP/Getty Images