Heavy artillery on parade during a review of the Moscow Garrison troops during the May Day celebrations in Red Square, passing posters of Lenin and Stalin. (Photo by N. Sitnikov/Hulton Archive/Getty Images). 1st May 1947

A competitor participates in the Tough Mudder challenge near Henley-on-Thames in southern England May 2, 2015. (Photo by Eddie Keogh/Reuters)

A helicopter drops water over a wildfire as a firefighter works to contain it in Benahavis, southern Spain, May 19, 2015. (Photo by Jon Nazca/Reuters)

English singer and songwriter Dua Lipa (right) seems to be happy hanging with British model Sarah Lysander early May 2022. (Photo by ellis_kaplan/Instagram)

Yang Estrada, 5, plays with a crab on the street in La Panchita, Cuba on May 28, 2022. (Photo by Alexandre Meneghini/Reuters)

American socialite and media personality Kylie Jenner in the second decade of May 2023 gets up close and personal with a selfie. (Photo by kyliejenner/Instagram)

Giant pandas enjoy food around a table at Chongqing Zoo, Chongqing, China on May 21, 2023. (Photo by Rex Features/Shutterstock)