After pilot Kenneth Arnold's 1947 sighting, which two-word term for an alien craft entered the language?

In which 1946 film noir does Rita Hayworth tease up a storm in Buenos Aires? What system of signaling uses flags held in different arm positions? Abdullah I, king from 1946 to 1951, dropped "Trans" from which country's name during his reign? The 1946 Linggadjati Agreement gave grudging Dutch recognition to the authority of which island nation's republic? Which 1947 film starred Cary Grant and Shirley Temple? King Michael abdicated in 1947 as monarch of which Eastern European nation? Which 1947 labor act made the closed-shop agreement illegal? Which artist painted "Christina's World" (1948)?