Experimental aircraft 'Solar Impulse 2',

Laurent Gilleiron/EPA

The experimental aircraft “Solar Impulse 2″, HB-SIB, during solar generator tests at an air base in Payerne, Switzerland, on Monday. The project aims to achieve the first circumnavigation of the world with an aircraft powered only by solar energy.

South Korea And U.S. Military Hold Live Fire Exercise

Chung Sung-Jun/Getty Images

A South Korean soldier from 26th Infantry division attends the United States and South Korean Joint live fire Exercise at Rodriguez Range on Friday in Pocheon, South Korea.

A bird perches on one of the 16,142 graves of the Douaumont cemetery near Verdun, northeastern France

Charles Platiau/Reuters

A bird perches on one of the 16,142 graves at Douaumont cemetery near Verdun, northeastern France. The cemetery is the largest single French military burial place of the first world war.

Sotheby's, London. Impressionist and Modern And Contemporary Art sales in New York

Daniel Jones/FT

Sotheby’s gallery technicians with “Blau”, by Gerhard Richter ($25m-$35m), adjust the canvas in London ahead of impressionist modern and contemporary art sales to be held in New York next month.

She shakes off bees after an attempt to cover his body with bees in Chongqing municipality

Reuters/China Daily

She Ping, a 34-year-old beekeeper, shakes off bees after an attempt to cover his body with bees in Chongqing municipality. He used queen bees to successfully attract more than 460,000 bees, weighing over 45 kg.

Car bomb explodes outside Bank of Greece

Yannis Kolesidis/EPA

Police bomb-disposal experts gather evidence at the site of an explosion in the centre of Athens, on Thursday

A tourist reacts as an elephant sprays her with water in celebration of the Songkran water festival in Thailand's Ayutthaya province

Chaiwat Subprasom/Reuters

An elephant sprays water on a tourist during the celebration of the Songkran water festival in Thailand’s Ayutthaya province, on Wednesday

Hindu girls dressed up as Kumari wait for rituals to start during Ramnavmi festival on outskirts of Kolkata

Reuters

Hindu girls dressed up as Kumari (an unmarried girl) wait for rituals to start during Ramnavmi festival at the Adyapeath Ashram on the outskirts of Kolkata on Tuesday

Deputies clash during a session of the parliament in Kiev

Valentyn Ogirenko/Reuters

Deputies clash during a session of the parliament in Kiev, Ukraine, on Tuesday

Indian voters wait in line outside a polling station in Dibrugarh

Dibyangshu Sarkar/AFP/Getty Images

Indian voters wait outside a polling station in Dibrugarh on Monday. Indians have begun voting in the world’s biggest election, which is set to sweep the Hindu nationalist opposition Bharatiya Janata party to power at a time of low growth, anger over corruption and warnings about religious unrest.