Question: A number of meta-analyses have found clinical hypnosis to be effective in controlling pain associated with diagnostic and surgical procedures in both adults and children, as well as pain associated with cancer and childbirth. A 2007 review of 13 studies found evidence for the efficacy of hypnosis in the reduction of chronic pain in some conditions, though the number of patients enrolled in the studies was low, bringing up issues of power to detect group differences, and most lacked credible controls for placebo and/or expectation. The authors concluded that "although the findings provide support for the general applicability of hypnosis in the treatment of chronic pain, considerably more research will be needed to fully determine the effects of hypnosis for different chronic-pain conditions."
Is there an answer to this question: What did meta-analyses find to be effective in controlling surgical procedures?

Answer: unanswerable


Question: The Cubs began play as the Chicago White Stockings, joining the National League (NL) as a charter member. Owner William Hulbert signed multiple star players, such as pitcher Albert Spalding and infielders Ross Barnes, Deacon White, and Adrian "Cap" Anson, to join the team prior to the N.L.'s first season. The White Stockings played their home games at West Side Grounds,against the bloods and quickly established themselves as one of the new league's top teams. Spalding won forty-seven games and Barnes led the league in hitting at .429 as Chicago won the first ever National League pennant, which at the time was the game's top prize.
Is there an answer to this question: When the Cubs started playing, who was their owner?

Answer: William Hulbert


Question: In 2006–07, researchers from the Wildlife Conservation Society studied gorillas in heavily forested regions centered on the Ouesso district of the Sangha Region. They suggest a population on the order of 125,000 Western Lowland Gorillas, whose isolation from humans has been largely preserved by inhospitable swamps.
Is there an answer to this question: What region is home to the gorillas studied by the Wildlife Conservation Society?

Answer: Sangha Region


Question: Mexico City is served by the Sistema de Transporte Colectivo, a 225.9 km (140 mi) metro system, which is the largest in Latin America. The first portions were opened in 1969 and it has expanded to 12 lines with 195 stations. The metro is one of the busiest in the world transporting approximately 4.5 million people every day, surpassed only by subway lines in Moscow (7.5 million), Tokyo (5.9 million), and New York City (5.1 million). It is heavily subsidized, and has some of the lowest fares in the world, each trip costing 5.00 pesos from 05:00 am to midnight. Several stations display pre-Columbian artifacts and architecture that were discovered during the metro's construction.[citation needed] However, the metro covers less than half of the total urban area. The Metro stations are also differentiated by the use of icons and glyphs which were proposed for people who could not read. The specific icons were developed based on historical (characters, sites, pre-Hispanic motifs), linguistic, symbolic (glyphs) or location references and has being emulated in further transportations alternatives in the City and in other Mexican cities. Mexico City is the only city in the world to use the icon reference and has become a popular culture trademark for the city.
Is there an answer to this question: When was the Mexico City metro system first opened?

Answer:
1969