Problem: What group sacked Baghdad in 1258, ending the Islamic Golden Age?
Answer: mongols

Problem: Although made by a variety of manufacturers, what is the name of the appliances sold by Sears?
Answer: kenmore

Problem: "Who directed the films; ""The Fisher King"" (1991), ""12 Monkeys"" (1995) and the ""Brothers Grimm"" (2005)?"
Answer: terry gilliam

Problem: What appeared in the Netherlands in 1608, developed by Hans Lippershey, Zacharias Janssen and Jacob Metius, and improved by Galileo in 1609?
Answer:
refracting telescope