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
5 days, 50 miles: The march that changed history. In 1965, civil rights marchers walked all the way from Selma to Montgomery, Alabama. CBS News' Bill Plante was there. This weekend marks 50 years since the violent crackdown on peaceful marchers in Selma, Alabama.