The damaged battleship USS California, listing to port after being hit by Japanese aerial torpedoes and bombs, is seen off Ford Island during the attack on Pearl Harbor, Hawaii, U.S. December 7, 1941. The 75th anniversary of the attack, which brought the United States into World War Two, is marked on December 7, 2016. (Photo by Reuters/U.S. Navy/National Archives)

Two giant puppets, a deep sea diver and his niece, roam through the streets of Liverpool, northern England, and April 20–23 looking for each other during the Sea Odyssey festival. The free event, organized by the French company Royal de Luxe is one of a series of events marking the 100th anniversary of the sinking of The Titanic. The liner, registered in Liverpool, sank on its maiden voyage to New York on April 15, 1912.

Photo: A giant deep sea diver emerges from the Albert Dock to begin a journey through the streets of Liverpool during the Titanic Sea Odyssey on April 20 in Liverpool, England. (Photo by Christopher Furlong)

“The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in Ukrainian SSR, which was under the direct jurisdiction of the central authorities in Moscow. An explosion and fire released large quantities of radioactive contamination into the atmosphere, which spread over much of Western USSR and Europe. It is widely considered to have been the worst nuclear power plant accident in history, and is one of only two classified as a level 7 event on the International Nuclear Event Scale (the other being the Fukushima Daiichi nuclear disaster)”. – Wikipedia (Photos by Alexandr Strannik, August 1986; Source: LiveJournal)

Russian Police detain opposition supporters during a “March of Millions” protest rally against Vladimir Putin's return in Moscow, Russia on May 6, 2012. Over 650 people were arrested including opposition leaders. (Photo by Dmitry Schedrin, Rustem Adagamov, Andrey Stenin)

Two of the first six “neighborhood electric vehicles” (NEV) to be leased by the U.S. Army are on display during an introductory ceremony at Fort Myer January 12, 2009 in Arlington, Virginia. The Army has leased 800 of the non-tactical NEVs with a goal of 4,000 vehicles by 2011. These NEVs are manufactured by the Global Electric Motorcars division of Chrysler Corporation. With a full eight-hour charge, the NEVs can traverse 30 miles at a top speed of 25-miles-per-hour. (Photo by Chip Somodevilla/Getty Images)

(L-R) U.S. President Barack Obama, Queen Elizabeth II and First Lady Michelle Obama arrive at Winfield House, the residence of the Ambassador of the United States of America, in Regent's Park, on May 25, 2011 in London, England. The 44th President of the United States, Barack Obama, and First Lady Michelle are in the UK for a two day State Visit at the invitation of HM Queen Elizabeth II. Last night they attended a state banquet at Buckingham Palace and today's events include talks at Downing Street and the President will address both houses of Parliament at Westminster Hall. (Photo by Yui Mok - WPA Pool/Getty Images)

Laura Titch, dressed as Mary of Guise, and Duncan Maclachlan, dressed as Alexander of Stewart, rehearse for Stirling Castle's grand renaissance palace opening on June 3, 2011 in Stirling, Scotland. The palace has been closed for two years, while a Ј12 million pound project was undertaken to return the palace to how it might have looked back in the 1540s, when it was home to Mary of Guise, the widow of James V. Their daughter, Mary Queen of Scots, was raised there before living in France. (Photo by Jeff J Mitchell/Getty Images)