As if San Franciscans need further proof that living in this city is absolutely wonderful: According to a 2011 Mercer survey, San Francisco is the second best city for quality of life in the U.S. Which city nabbed the top spot? Honolulu. Mercer ranked the cities according to 39 factors categories in 10 groups, including political/social environment, health and sanitation, education, public services, economic climate and recreation. [SFGate/photo via Sergio]
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