Fittingly, Cincinnati, Ohio, lies on which river?

Which actor died in a 1955 car crash near Paso Robles, California, while driving his Porsche 550 Spyder? Which very dark shade of blue takes its name from the hour of 12 a.m.? Which 1937 Fred Astaire and Ginger Rogers film has a title that asks a question? Which 1982 Prince song got heavy airplay 17 years after its release, when its title year finally arrived? Disco giant Nile Rodgers of Chic produced which singer's 1983 album "Let's Dance"? Fittingly, which writer of Westerns was born in 1872 in Zanesville, Ohio? Which astronomer, a longtime champion of SETI, wrote an October 1994 article titled "The Search for Extraterrestrial Li… Which singer's 1976 No. 1 hit "Welcome Back" was the theme song of TV's "Welcome Back, Kotter"?