Williams syndrome: A genetic disorder characterized by mild mental retardation, unique personality characteristics, unusual facial features, and cardiovascular disease. The level of calcium tends to be high in blood (hypercalcemia) and urine (hypercalciuria).
Long March: Long March, (1934â35), the 6,000-mile (10,000-km) historic trek of the Chinese communists, which resulted in the relocation of the communist revolutionary base from southeastern to northwestern China and in the emergence of Mao Zedong as the undisputed party leader. Fighting Nationalist forces
The Tiananmen Square protests were sparked by the death of Hu Yaobang on 15 April 1989. By the eve of Hu's state funeral, some 100,000 students had gathered at Tiananmen Square to observe it; however, no leaders emerged from the Great Hall. The movement lasted for seven weeks.