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
Quick Answer. The main Great Wall of China stretches approximately 5,500 miles along the southern edge of Inner Mongolia. Explorer experts state that it takes 18 months to walk its entire length. It was constructed during the Ming dynasty in the 14th and 15th century, and is sometimes called the Ming Wall. Continue Reading.