Students play in their school yard on the first day of the new school term at a primary school in Baghdad, October 18, 2015. (Photo by Ahmed Saad/Reuters)

Students of the "Escola de Papai Noel do Brasil" (Brazil's school of Santa Claus) travel on a ferry through Guanabara bay, during their graduation ceremony in Rio de Janeiro, Brazil, November 10, 2015. The school holds 4 days' lessons in Santa-training, teaching Christmas carols, how to interact with children, and also how to wear the heavy red suit in Rio's typical 104-degree (40 degrees celsius) summer weather that is common around the holidays. (Photo by Pilar Olivares/Reuters)

Models prepare for the Glasgow School of Art Fashion show on March 13, 2012 in Glasgow, Scotland. Third year textiles and fashion students unveil their striking new collections, inspired by the idea of movement. The Glasgow School of Art has produced some of the most celebrated designers of recent years, notably Jonathan Saunders. (Photo by Jeff J. Mitchell/Getty Images)

The first gender-neutral restroom in the Los Angeles school district is seen at Santee Education Complex high school in Los Angeles, California, U.S., April 18, 2016. (Photo by Lucy Nicholson/Reuters)

Hello, madhouse! Listen to good music!! Love you! Yours truly, Avax. Music video: Co-Ed School (남녀공학 or 男女共学) – Bbiribbom Bbaeribbom (삐리뽐 빼리뽐)

A model presents a creation made of plastic cutlery during Trash Fashion Show in Macedonia's capital Skopje, on Wednesday, June 5, 2013. Teams from 47 high schools from Macedonia participated in the show with creations made of redesigned materials from waste such as plastic bags, newspapers, cardboard, plastic bottles, cans, used paper, etc. (Photo by Boris Grdanoski/AP Photo)

Greyhounds with stuffed and sprung model monkeys strapped to their backs before a hurdle race at Wellinborough. (Photo by E. Bacon). 21st April 1928