Title: Incandescent light bulb.
Question: How long is a typical uncoiled tungsten filament for a 60-watt bulb?

Title: Hyderabad.
Question: In the 18th century there was one global trading hub for large diamonds, what was it?

Title: Spectre (2015 film).
Question: Estrella was played by which actress?

Title: Middle Ages.
Question:
What Byzantine Emperor's request for assistance led to the First Crusade?