Problem: Which country's name, existing 1929-2003, meant 'South Slavs'?
Answer: yugoslavia

Problem: The song La donna e mobile comes from which Verdi opera?
Answer: rigoletto

Problem: What American TV serial, first broadcast between April 1990 and June 1991, followed an investigation headed by Special Agent Dale Cooper?
Answer: twin peaks

Problem: Which letter of the alphabet is denoted by a single dot in the Morse code?
Answer:
e