How many square inches are in a square foot?

A spirometer measures the capacity of which organs? A split in the Plantagenet family led to which series of civil wars in the 1400s? What is a spring-loaded door fastener called? A squad of guinea pigs tries to stop a diabolical billionaire from taking over the world in which 2009 film? A square, a museum and an office building in which capital are named for Simon Bolivar, born there in 1783? What word names a squash or pumpkin and sounds like "pierced by a bull's horn"? A stadium whose tent-like roof was then the world's largest was built for the 1972 Olympics in which city? A stage musical based on which 1997 film about unemployed steel workers turned strippers opened in 2000?