What word means conversation marked by quick, witty replies?

Controlling yellow fever greatly aided the completion of which large Central American project in 1914? Which controversial conductor led the Berlin Philharmonic for decades and died in July 1989? Controversial even when serialized in The National Era, which novel sold about 300,000 copies in book form in 1852? A 2003 ruling to remove a monument from an Alabama judicial building sparked controversy. What did the monument feature? Explorer James Cook was killed on Valentine's Day 1779 in which island group? Which cool cocktail combines gin, lime juice and club soda? Which bandleader titled his 1939 autobiography "The Kingdom of Swing"? Coors beer is brewed in which Colorado city?