Q: Does "The U.S. recession that began in December 2007 ended in June 2009, according to the U.S. National Bureau of Economic Research (NBER) and the financial crisis appears to have ended about the same time." provide a valid answer to "On what date did President Barack Obama declare that the markets are stabilized?"?
A: no

Q: Does "In Greater Boston, these numbers grow significantly with Puerto Ricans numbering 175,000+, Dominicans 95,000+, Salvadorans 40,000+, Guatemalans 31,000+, Mexicans 25,000+, and Colombians numbering 22,000+." provide a valid answer to "How many Puerto Rican hispanics live in greater Boston?"?
A: yes

Q: Does "Since DST is applied to many varying communities, its effects may be very different depending on their culture, light levels, geography, and climate; that is why it is hard to make generalized conclusions about the absolute effects of the practice." provide a valid answer to "During what season is DST usually not observed because of the detriments of dark mornings?"?
A: no

Q: Does "In a famous paper of 1936 with Garrett Birkhoff, the first work ever to introduce quantum logics, von Neumann and Birkhoff first proved that quantum mechanics requires a propositional calculus substantially different from all classical logics and rigorously isolated a new algebraic structure for quantum logics." provide a valid answer to "With whom did von Neuman work on a paper in 1936 that introduce quantum logic?"?
A:
yes