Which 1990 Madonna hit, named after a magazine, turned a dance from New York's ballroom scene into a craze?

In 1990, festivities for the 20th anniversary of which annual observance included a trash cleanup trek on Mount Everest? Who won the Academy Award for Best Actress for the 1990 film "Misery"? Which film was the biggest U.S. box-office hit of 1990, ahead of "Ghost," "Dances with Wolves" and "Pretty Woman"? Jimmy Smits won a 1990 Emmy for playing attorney Victor Sifuentes on which legal drama? Which 1990 Martin Scorsese film tells the story of mobster Henry Hill? Which rapper's 1990 album "Please ___ Don't Hurt 'Em" featured "U Can't Touch This"? In which 1990 film does Sean Connery play a Soviet captain who defects to the U.S. with his high-tech submarine? What was the title of Eddie Murphy's 1990 sequel to his 1982 hit "48 Hrs."?