World, with approximately 40

Tianzhou 2 was a mission of the Tianzhou-class unmanned cargo spacecraft. The launch took place at 29 May 2021, 12:55:29 UTC. The spacecraft successfully docked with the Tiangong space station later on the same day.

Leo Kestenberg was a German-Israeli classical pianist, music educator, and cultural politician. Working for the government in Prussia from 1918, he began a large-scale reform of music education (Kestenberg-Reform) which aimed to teach music to all, beginning with small children, and including the education of their teachers. In exile in Prague, he was instrumental in forming the and administrating the first international organization for music education, which became ISME. He fled Nazi Germany in 1933 and later moved to Mandatory Palestine, where he founded a seminary for music teachers and privately taught pianists such as Menahem Pressler and Alexis Weissenberg.

The Patriotic Revolutionary Youth Movement was the urban, militant youth wing of the Kurdistan Workers' Party (PKK) from 2006-2015. Trained by more experienced PKK cadres for urban fighting, and consisting mostly of children and adults in the 15-25 age group, it was reportedly established in 2006. The group started to clash with Turkish security forces and tried to enforce their authority in the areas they were located in 2014 as part of a strategy which involved unilateral declaration of self-management in various towns in southeastern Turkey, and creation of trenches and barricades reinforced with IEDs and explosives to deny security forces access.