SHENZHEN, GUANGDONG - APRIL 05: (CHINA OUT) The noctiluca scintillans glows at Dapeng bay on April 5, 2016 in Shenzhen, Guangdong Province of China. The noctiluca scintillans could glow blue light when stimulated in the sea. (Photo by VCG/VCG via Getty Images)
HAVANA, CUBA - MARCH 25: Rolling Stones fans wait for the start of a free concert March 26, 2016 in Havana, Cuba. Thousands of fans waited for the Rolling Stones to play for the first time in Cuba, after the music was once banned by the government. (Photo by Joe Raedle/Getty Images)
MATHURA, INDIA - MARCH 18: An Indian child smeared with coloured powder takes part in the Holi Festival celebrations in Mathura, India on March 18, 2016. Holi, the festival of colours, is a riotous celebration of the coming of spring and falls on the day after full moon annually in March. Revellers spray coloured powder and water on each other with great gusto, whilst adults extend the hand of peace. (Photo by Metin Aktas/Anadolu Agency/Getty Images)
TOPSHOT - A man reacts as people gather to observe a minute of silence in memory of the victims of the Brussels airport and metro bombings, on the Place de la Bourse in central Brussels, on March 23, 2016, a day after the triple blasts killed some 30 people and left around 250 injured.
World leaders united in condemning the carnage in Brussels and vowed to combat terrorism, after Islamic State bombers killed around 35 people in a strike at the symbolic heart of the EU. / AFP / PATRIK STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)
A surfer looks at the Northern lights ( aurora borealis ) illuminating the sky over the snow covered beach of Unstad, on Lofoten Islands, Arctic Circle, on March 14, 2016.
Surfers from all over the world come to Lofoten island to surf in extrem conditions. Ocean temperature is 5-6 °C, air temperature around 0°C in spite of a weather very unstable. / AFP / OLIVIER MORIN (Photo credit should read OLIVIER MORIN/AFP/Getty Images)
TOPSHOT - Malaysian school children wearing glasses with special filters watch the partial solar esclipse at the National Planetarium in Kuala Lumpur on March 9, 2016.
A total solar eclipse swept across the vast Indonesian archipelago on March 9, witnessed by tens of thousands of sky gazers and marked by parties, Muslim prayers and tribal rituals. Partial eclipses were also visible over other parts of Asia and Australia. / AFP / MOHD RASFAN (Photo credit should read MOHD RASFAN/AFP/Getty Images)
ACEH, INDONESIA-FEBRUARY 28: People pray for the world peace in front of Aceh police office yard in Banda Aceh, Indonesia on February 28, 2016. Thousands of Indonesian Muslims has been prayed for no more groups that perpetrate acts of terror in the so-called name of Islam both in Indonesia and around the world. (Photo by Junaidi Hanafiah/Anadolu Agency/Getty Images)
Red Cross flags flutter in the wind on June 26, 2009 at the International Red Cross (IRC) humanitarian camp in Solferino, about 150km east of Milan to mark the 150th anniversary of the International Red Cross which was founded by Switss Henry Dunant after the battle of Solferino. Around 5000 volunteers from 186 nations are expected for workshops and exercises with the Emergency Relief Unit (ERU). AFP PHOTO/DAMIEN MEYER (Photo credit should read DAMIEN MEYER/AFP/Getty Images)
Mar del Plata, Argentina ñ August, 2015: Kian Ackroyd, 10, warms up before his freestyle competition for team USA. Kian received a liver transplant at just eight months old. He wins four gold medals at the 2015 World Transplant Olympics, three for swimming, one for long jump.
Servicemen of Ukrainian volonteers battalion of Donbass unload ummunition from Armoured Personnel Carrier (APC) in the village of Shirokine, Donetsk region on June 6, 2015. US President Barack Obama urged fellow leaders of the G7 to stand up to "Russian aggression in Ukraine" as he enjoyed a traditional Bavarian welcome ahead of their summit in Germany. AFP PHOTO/ ALEKSEY CHERNYSHEV (Photo credit should read ALEKSEY CHERNYSHEV/AFP/Getty Images)