Ender Moreno looks for gold at La Culebra gold mine in El Callao, Bolivar state, southeastern Venezuela on March 1, 2017. Although life in the mines of eastern Venezuela is hard and dangerous, tens of thousands from all over the country head for the mines daily in overcrowded trucks, pushed by the rise in gold prices and by the severe economic crisis affecting the country, aggravated recently by the drop in oil prices. (Photo by Juan Barreto/AFP Photo)

Pamukkale, Turkey, is home to these terrace pools, formed by the build-up of carbonate mineral from the warm water flowing from the thermal springs above. (Photo by Image Courtesy of Jennifer Hayes/Getty Images)

Over 30 Douglas C-47 Skytrains (Dakotas) making final preparations for flight formation practice before the 75th D-Day Anniversary flight to Normandy in Duxford, England on June 4, 2019. (Photo by UK Air Force Images)

Model Bar Refaeli arrives at amfAR's Cinema Against AIDS 2007 at Le Moulin de Mougins on May 23, 2007 in Mougins, France. The amfAR Foundation raises funds for research, education and treatment of AIDS/HIV worldwide.

Buddhist monks pray at Borobudur temple on Vesak Day, commonly known as “Buddha's birthday”, at the Borobudur Mahayana Buddhist monument on May 17, 2011 in Magelang, Indonesia. (Photo by Ulet Ifansasti/Getty Images)

“The 1926 general strike in the United Kingdom was a general strike that lasted nine days, from 4 May 1926 to 13 May 1926. It was called by the general council of the Trades Union Congress (TUC) in an unsuccessful attempt to force the British government to act to prevent wage reduction and worsening conditions for coal miners”. – Wikipedia

Photo: Oxford University Student Volunteers during the General Strike in an aggressive pose. (Photo by Fox Photos/Getty Images)