In 1963, a "hot line" emergency link went into effect between Washington, D.C., and which world city?

In November 1950, U.S. pilot Russell Brown in an F-80 was credited with shooting down which type of Soviet-built jet? In 1959, which spiritual leader of Tibet fled into exile in India? In 1961, which African-American soprano made her Metropolitan Opera debut as Leonora in "Il trovatore"? In 1962, which country swapped 1,113 prisoners it had captured in the Bay of Pigs invasion for $53 million in aid? In 1963, the Four Seasons sang about being "happy as can be" with which sweet "Girl"? In 1966, which St. Louis structure won the American Institute of Architects' Henry Bacon Medal? In 1969, Michael and his brothers released their debut album "... Presents the Jackson 5", named for which Motown diva? In 1969, the title of chief justice passed from which Warren to Warren Burger?