What happened at Dec. 22?
1: 3 days before Chrismas(?)
880年：黄巢叛军占领唐朝东都洛阳。
1968年：《人民日报》文章引述了毛泽东指示：“知识青年到农村去，接受贫下中农的再教育，很有必要。”随即上山下乡运动大规模开始。
1989 – Berlin’s Brandenburg Gate re-opens after nearly 30 years, effectively ending the division of East and West Germany.
2010 – The repeal of the Don’t ask, don’t tell policy, the 17-year-old policy banning homosexuals serving openly in the United States military, is signed into law by President Barack Obama.
2020年:
