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Young monks take a break from their studies at Changangkha Lhakhang temple in Thimphu, Bhutan, April 13, 2016. Built in the 12th century, Changangkha Lhakhang is the oldest temple in Thimphu. REUTERS/Cathal McNaughton 
A portrait of Russian President Vladimir Putin, knitted with huge wooden needles (R) by artist Natalia Yudina, is seen in a show room during preparations for the Museum Night at Krasnoyarsk Museum Centre in the Siberian city of Krasnoyarsk, Russia, April 13, 2016. REUTERS/Ilya Naymushin 
U.S. Democratic presidential candidate and U.S. Senator Bernie Sanders greets Communications Workers of America (CWA) workers striking against Verizon in Brooklyn, New York April 13, 2016. REUTERS/Brian Snyder 
A boy stands on the staircase of a riddled building in Beirut, Lebanon April 13, 2016. Wednesday marked the 41st anniversary of Lebanon's civil war (1975-1990). REUTERS/Mohamed Azakir 
U.S. President Barack Obama blows bubbles during the 2016 White House Science Fair in Washington, April 13, 2016. The bubble maker was made on a 3D printer by Jacob Leggette, 9, of Baltimore, Maryland. REUTERS/Kevin Lamarque 
U.S. Democratic presidential candidate and U.S. Senator Bernie Sanders holds a campaign rally in Washington Square Park in the Greenwich Village neighborhood of New York, New York April 13, 2016. REUTERS/Brian Snyder 
A reveler reacts during a water fight at Songkran Festival celebrations in Bangkok, Thailand April 13, 2016. REUTERS/Jorge Silva 
A migrant throws back a tear gas canister during scuffles with police at a makeshift camp for refugees and migrants at the Greek-Macedonian border near the village of Idomeni, Greece, April 13, 2016. Macedonian police fired tear gas on Wednesday to disperse around 50 migrants stranded in Greece who tried to pull down part of the razor wire fence separating the two countries, a Reuters witness said. REUTERS/Stoyan Nenov 
Civilians flee their homes to head to safer areas due to clashes between Iraqi security forces and Islamic State militants in the town of Hit in Anbar province, Iraq. REUTERS/Stringer 
A soldier from Indonesia's Rapid Reaction Strike Force (PPRC) jumps out from the back of an Air Force transport plane during a parachute training exercise in Tarakan, North Kalimantan province. REUTERS/Fadlansyah/Antara Foto  
King Willem Alexander and Queen Maxima of the Netherlands pose as they visit the Alte Pinakothek hosting Dutch masterpieces from the 17th century in Munich, southern Germany. REUTERS/Sven Hoppe/Pool 
Edwin Morales, one of the leaders of a protest march, with a thin chain hanging from his prosthetic eye, is pictured after a news conference in La Paz. Hundreds of people with physical disability marched from Cochabamba to La Paz to demand that the government of Bolivia's President Evo Morales increase their monthly disability subsidy by 500 Bs ($70) a month, according to local media. REUTERS/David Mercado 
Flower fields at seen from an aerial view in Yangzhou, Jiangsu Province, China. REUTERS/Stringer 
A man covers his face as he pushes a bicycle through a dust storm on the banks of the Ganga river in Allahabad, India. REUTERS/Jitendra Prakash 
Physicist Stephen Hawking sits on stage during an announcement of the Breakthrough Starshot initiative with investor Yuri Milner in New York. REUTERS/Lucas Jackson 
A boy sits on his ball next to a border fence on the Greek side of the border, as Macedonian police stand guard on the Macedonian side, close to a makeshift camp for refugees and migrants near the Greek village of Idomeni. Picture taken from the Greek side of the border. REUTERS/Alexandros Avramidis 
A girl receives polio vaccination drops during a house-to-house vaccination campaign in Yemen's capital Sanaa. REUTERS/Khaled Abdullah 
A Hindu girl has her face painted before taking part in a ritual as part of the annual Shiva Gajan religious festival on the outskirts of Agartala, India. REUTERS/Jayanta Dey 
A still image taken from a video rendering shows phased arrays of lasers which could be used on Breakthrough Starshot, a $100 million research and engineering program aiming to demonstrate proof of concept for light-propelled spacecrafts. Billionaire Internet investor Yuri Milner announced the $100 million initiative on Tuesday to better understand the cosmos, this time by deploying thousands of tiny spacecraft to travel to our nearest neighboring star system and send back pictures. REUTERS/Breakthrough Initiatives 
Britain's Catherine, Duchess of Cambridge, feeds a baby elephant at the Centre for Wildlife Rehabilitation and Conservation (CWRC) at Panbari reserve forest in Kaziranga, in the northeastern state of Assam, India. REUTERS/Adnan Abidi 
Syria's President Bashar al-Assad casts his vote next to his wife Asma inside a polling station during parliamentary elections in Damascus, Syria. REUTERS/SANA   
An Air Force Test Pilot School T-38C jet passes in front of the sun at supersonic speed, creating shockwaves that are caught photographically for research. NASA is using a modern version of a 150-year-old German photography technique -- schlieren imagery -- to visualize supersonic flow phenomena with full-scale aircraft in flight. The results will help engineers to design a quiet supersonic transport, according to NASA. REUTERS/NASA