One of the main reasons that the Three Gorges dam was built was to prevent flooding further downstream. The need for a dam was highlighted in 1954 when people were killed as a result of flooding of the Yangtze River.
Arab Spring refers to the democratic uprisings that arose independently and spread across the Arab world in 2011. The movement originated in Tunisia in December 2010 and quickly took hold in Egypt, Libya, Syria, Yemen, Bahrain, Saudi Arabia, and Jordan.
4 The Syrets Concentration Camp Revolt 1943. The Nazis installed a camp in Syrets, the western suburb of Kiev, in June 1942. It was one of the first built so far east of Germany or Poland, and its purpose was to force its Jewish prisoners to clean up all evidence of the Babi Yar massacre.