In the early 1940s, BMW test-flew which radical new type of aircraft engine?

Cher's 1991 video "A New Attitude" was what kind of video? "God Bless the Child" was the signature tune of which singer, who appeared at the Apollo with Count Basie in 1937? Which 1956 Elvis Presley hit was based on the Civil War-era song "Aura Lee"? Which civil rights activists rode buses through the South in 1961 to challenge segregated bus terminals? Which Gleason's Gym-trained boxer, subject of the film "Raging Bull", held the middleweight title from 1949 to 1951? Chester A. Arthur became president in 1881 after the assassination of which president? Chester Gillette's murder of his pregnant girlfriend inspired which 1925 Theodore Dreiser novel? Which comedian played Chester Lee, a girls' soccer coach, in the film "Ladybugs"?