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A half-mile section of China's Yellow River turned red after an unknown substance was poured into it from a sewage pipe. Environmental protection officials were trying to determine whether the sewage was toxic. The incident in Lanzhou, a city of 2 million people in western Gansu province, follows a string of industrial accidents that have poisoned major rivers in China over the last year, forcing several cities to shut down their water systems.

DEFINITION: (noun) A person who has received a degree from a high school, college, or university. SYNONYMS: graduate, alumnus, grad, alum. USAGE: The alumna was trying to locate a fellow graduate of the women's college.

Trujillo controlled the Dominican Republic from 1930 to 1961. Although he won respect for allowing Jewish refugees into the country at a time when other nations were turning them away, his regime was considered autocratic and ruthless. He used terrorist methods to repress Dominican opposition, and in 1937, to stop Haitian infiltration, he ordered thousands of Haitians massacred. Trujillo was killed by members of his own armed forces. What role did the CIA purportedly play in the assassination?

The Concorde was the world's only supersonic passenger jet to provide long-standing service to the public. It was built through a partnership between Britain and France and became an important symbol of European innovation after its inaugural flight in 1976. The Concorde was able to make the transatlantic voyage possible in just over three hours, but the aircraft was retired as a result of low passenger numbers and rising maintenance costs. Who was on the final flight?

Perfect pitch, also known as absolute pitch, refers to the ability to identify any tone upon hearing it sounded alone or to sing any specified tone. Experiments have shown that this ability, a form of memory, can be acquired through practice, but in some individuals it appears to be inborn. There does not seem to be a correlation between absolute pitch and musical genius. Can you name two celebrated composers who possessed this ability, as well as two who did not?