Which controversial conductor led the Berlin Philharmonic for decades and died in July 1989?

Contrary to its name, which yellow mustard brand, introduced in 1904, is American? Contrary to popular belief, Humphrey Bogart never says "Play it again, Sam" in which 1942 film? Control of which Caribbean island was a central concern of the Spanish-American War? Controlling yellow fever greatly aided the completion of which large Central American project in 1914? 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? What word means conversation marked by quick, witty replies? Explorer James Cook was killed on Valentine's Day 1779 in which island group?