Which two-letter Spanish word means the opposite of "sí"?

In a 1976 New York magazine article, Tom Wolfe gave the 1970s which self-centered nickname? A highlight of NEBRASKAland Days in North Platte is a pro rodeo named for which Wild West showman? In a 1968 song, which title character do the Beatles tell to "take a sad song and make it better"? In his 1690 work "Two Treatises of Government," which philosopher argued against the divine right of kings? Which popular Chinese dish consists of stir-fried shredded pork and vegetables served wrapped in thin pancakes? Which Buddy Holly hit, released just weeks before his death in 1959, was written by Paul Anka? In 1962 the Everly Brothers were "Crying in the Rain." In 1965, where was Elvis Presley crying in his hit song? The term "Gioconda smile" refers to an enigmatic smile like the famous one painted by which artist?