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)

REUTLINGEN, GERMANY - NOVEMBER 17: Students hang out finished parchment leather at the LGR (Lederinstitut Gerberschule Reutlingen) tannery school on November 17, 2010 in Reutlingen, Germany. Even in early antiquity and up their hair or dried goat and sheep skins were used as material for documents. In the small Asian city Pergamon these skins were processed in large quantities for this purpose, so they formed the main trading arm of the city, of which the name is parchment is derived. In medieval times, reached the parchment is of great importance, it was such as France's production under the supervision of the University of Paris. Even now, important documents, placed on their unlimited shelf life as possible large value (eg diplomas, addresses, memory, writings, documents for primary and keystones) written on parchment...

A white lipizzaner Stallion performs during the Spanish Riding School of Vienna Gala Performance at Wembley Arena on November 24, 2011 in London, England. (Photo by Chris Jackson/Getty Images)

A police officer walks along a street of the burning village of Smolenka near Chita on Monday, April 13, 2015. Russian authorities say out-of-control agricultural fires have killed at least 15 people, injured hundreds more and destroyed or damaged more than 1,000 homes in Siberia. The fires were started by farmers burning the grass in their fields, but spread quickly because of strong winds. (Photo by Evgeny Yepanchintsev/AP Photo)

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)

A view of the facade of a house in the village of Cherevkovo, Arkhangelsk region, Russia, July 12, 2016. Traditional wooden houses, many featuring exquisite carvings and craftsmanship, are falling into decay across Russia because of neglect, lack of funds and an exodus from the countryside to the cities. Urbanisation and a low birth rate are emptying out the countryside, and residents and authorities are often largely indifferent towards the historical value of their properties. (Photo by Maxim Shemetov/Reuters)

US President George W. Bush (R) and Russian President Vladimir Putin wave as the two presidents go for a ride in Putin's 1956 Volga before dinner 08 May 2005 at the his residence outside of Moscow. Bush hailed Russia's “bravery and sacrifice” in defeating Nazism, as he met Putin ahead of ceremonies marking the 60th anniversary of the end of World War II. Bush, who the previous day criticized the decades-long Soviet occupation of central Europe, said he was looking forward to the 09 May ceremony on Moscow's Red Square, to be attended by over 50 national leaders. (Photo by Tim Sloan/AFP Photo)