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
How long did it take Marco Polo to reach China?   When Marco was 17, he accompanied his father and uncle on their second journey to Asia. The Polos had traveled 5600 miles (9000 km) in over three and a half years to rea â¦ ch Cathay.