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 Great Wall of China winds up and down across deserts, grasslands, mountains and plateaus of northern China, stretching approximately 6,700 kilometers (4,163 miles) from the Jiayu Pass (in Gansu Province) in the west, to the mouth of the Yalu River (in Liaoning Province) in the east.