U.S. President Barack Obama speaks at the foot of the Edmund Pettus Bridge in Selma, Alabama March 7, 2015. With a nod to ongoing U.S. racial tension and attempts to limit voting rights, Obama declared the work of the Civil Rights Movement advanced but unfinished on Saturday on a visit to the Alabama bridge that spawned a landmark voting law. REUTERS/Tami Chappell (UNITED STATES - Tags: POLITICS ANNIVERSARY SOCIETY)

Corporals Verica Zlatevska (L) and Dragana Kitanovska (R) attend an honour guard training session at an army barracks in Skopje March 4, 2015. Macedonia's honour army battalion, the ceremonial uniformed guard that receives every foreign president, dignitaries and delegations, but also sees off and welcomes the head of state every time he leaves the country, has a different glow. For the first time in the history of Macedonia's army, the honour guard has two women in its ranks. There has not been an event in which one of them is not in the first row. Zlatevska joined the army in 2003, Kitanovska in 2006. Picture taken March 4, 2015. REUTERS/Ognen Teofilovski (MACEDONIA - Tags: MILITARY SOCIETY)

The QUANT e-Sportlimousine by nanoFlowcell AG is pictured at the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

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