Workers clean empty cooking oil containers at a roadside recycling workshop in Kolkata, India, July 13, 2016. (Photo by Rupak De Chowdhuri/Reuters)

A bakery worker rides a bicycle as he carries fresh bread on his head in Cairo, Egypt, February 9, 2016. (Photo by Asmaa Waguih/Reuters)

A subway worker walks away after a train departed the station in central Pyongyang, North Korea May 7, 2016. (Photo by Damir Sagolj/Reuters)

A worker harvests rice in the Sakon Nakhon province of Thailand in the last decade of January 2024. (Photo by Natnattcha Chaturapitamorn/Solent News)

Worker Shi Shenwei pulls a wheelbarrow at the construction site of a Buddhist temple in the village of Huangshan, near Quanzhou, Fujian Province, China, September 28, 2016. For most construction workers, lunch is a welcome break to rest and refuel. Not for Shi Shenwei. the 23-year-old spends his midday break jumping and swinging through a maze of scaffolding poles, performing a fitness routine that has made him China's latest social media sensation. (Photo by Thomas Peter/Reuters)

A worker walks beside the ocean liner Queen Mary II in a dock at Blohm&Voss shipyard in Hamburg, Germany, June 14, 2016. The mighty Queen Mary 2 is just days away from setting sail after the most expensive refurbishment of any ship in history. Tens of millions of pounds have been spent on the 151,200-tonne ship as 2,500 workers complete the month-long major interior overhaul. (Photo by Fabian Bimmer/Reuters)

A rail worker fixing a fog warning notice at South Woodford Railway Station in Essex. (Photo by H. F. Davis/Topical Press Agency/Getty Images). 20th October 1938

A worker collects rubber sap at a farm in Songon village, north of Abidjan, February 3, 2016. (Photo by Luc Gnago/Reuters)