The problem: Answer a question about this article:
Historical aspects of the Expo line route are noteworthy. It uses the right-of-way for the Santa Monica Air Line that provided electric-powered freight and passenger service between Los Angeles and Santa Monica beginning in the 1920s. Service was discontinued in 1953 but diesel-powered freight deliveries to warehouses along the route continued until March 11, 1988. The abandonment of the line spurred concerns within the community and the entire right-of-way was purchased from Southern Pacific by Los Angeles Metropolitan Transportation Authority. The line was built in 1875 as the steam-powered Los Angeles and Independence Railroad to bring mining ore to ships in Santa Monica harbor and as a passenger excursion train to the beach.
Diesel powered freight deliveries continued through what date?
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The answer: March 11, 1988

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Queen composed music that drew inspiration from many different genres of music, often with a tongue-in-cheek attitude. The genres they have been associated with include progressive rock, symphonic rock, art rock, glam rock, hard rock, heavy metal, pop rock, and psychedelic rock. Queen also wrote songs that were inspired by diverse musical styles which are not typically associated with rock groups, such as opera, music hall, folk music, gospel, ragtime, and dance/disco. Several Queen songs were written with audience participation in mind, such as "We Will Rock You" and "We Are the Champions". Similarly, "Radio Ga Ga" became a live favourite because it would have "crowds clapping like they were at a Nuremberg rally".
What kind of metal has Queen been associated with?
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The answer: heavy metal

The problem: Answer a question about this article:
Pain is a distressing feeling often caused by intense or damaging stimuli, such as stubbing a toe, burning a finger, putting alcohol on a cut, and bumping the "funny bone". Because it is a complex, subjective phenomenon, defining pain has been a challenge. The International Association for the Study of Pain's widely used definition states: "Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage." In medical diagnosis, pain is a symptom.
What organization's definition is widely used?
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The answer: The International Association for the Study of Pain

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Originally much of the valley laid beneath the waters of Lake Texcoco, a system of interconnected salt and freshwater lakes. The Aztecs built dikes to separate the fresh water used to raise crops in chinampas and to prevent recurrent floods. These dikes were destroyed during the siege of Tenochtitlan, and during colonial times the Spanish regularly drained the lake to prevent floods. Only a small section of the original lake remains, located outside the Federal District, in the municipality of Atenco, State of Mexico.
What happened to the dikes the Aztecs built?
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The answer:
destroyed during the siege of Tenochtitlan