Aeroflot employees with a puppy at the canine service of Aeroflot at Sheremetyevo International Airport in Moscow Region, Russia on October 2, 2020, that has started to train service dogs to detect COVID-19 in people. (Photo by Vladimir Gerdo/TASS)

Three prostitutes lean out of a window in Santiago, Chile, in an attempt to entice customers inside, circa 1950. (Photo by Three Lions/Getty Images)

A vendor sleeps as his son waits for customers at their roadside vegetable shop in New Delhi, February 12, 2019. (Photo by Adnan Abidi/Reuters)

Vendors wait for customers at a wholesale vegetable market in Dhaka on September 4, 2022. (Photo by Munir Uz Zaman/AFP Photo)

A new monorail service in Houston, Texas, ready for its inaugural service. (Photo by Evans/Three Lions/Getty Images). Circa 1950

Members of the Indian Army display aerobatic Taekwondo skills during the 11th Reunion and 262nd Anniversary of Army Service Crops in Bangalore, India, 09 December 2022. The 11th ASC Reunion & 262nd Corps Day will be held at Army Service Corps (ASC) Centre & College on 8th and 9th of December 2022, to showcase the military capabilities. Indian Army Service Corps, established in 1760, is an arm of the Indian Army handling logistic support. (Photo by Jagadeesh N.V./EPA/EFE/Rex Features/Shutterstock)

A roadside ice-cream vendor waits for customers at a market in New Delhi, India, April 7, 2016. The Indian economy is characterized by the existence of a vast majority of informal or unorganized labor employment. (Photo by Altaf Qadri/AP Photo)

Adventurer Sam Cossman movies towards the huge lava lake wearing a custom built industrial proximity heat suit on December 20, 2014 in Ambrym, Vanuatu. (Photo by Conor Toumarkine/Barcroft Media)