Abbie Hoffman's "Yippies" took their name from which group?

ABBA hit the U.S. top 40 in 1975 with which three-letter palindrome? Which ABBA-based musical passed "Hello, Dolly!" in number of Broadway performances in 2008? In ABBA's "Dancing Queen", the dancing queen is "young and sweet, only..." what age? Abbey Theatre director Lady Augusta Gregory was the patron of which poet she met in 1896? What is Abbott and Costello's most famous comedy routine? Which standard system of weight, based on a 16-ounce pound, is abbreviated "avdp"? Which organization, abbreviated CIS, replaced the USSR in 1991? Which former Soviet republic, abbreviated EST, became independent in 1991?