An 1898 opera by Rimsky-Korsakov concerned which two composers, later rivals in the film "Amadeus"?

Which title of an 1895 novel by Henryk Sienkiewicz is Latin for "Where are you going?" An 1895 textbook called which shapeless one-celled creature the lowest form of animal life? The 1897 "Officer's Knife," with a corkscrew and a second blade, became known by what name? An 1898 Amsterdam exhibition devoted to which Old Master has been called the first blockbuster art show? An 1898 rampage by man-eating lions halted construction of a railway between Mombasa and which body of water? "Voyna i mir" is the Russian title of which novel, made into a Soviet film epic running more than seven hours? A major study published in 1997 found that which fields from power lines did not raise children's risk of leukemia? What would an $80 shirt cost if it were reduced in price by 20%?