Title: Gregorian calendar.
Question: If you need a date of four days less, what do you subtract from the Julian calendar?

Title: Alexander Graham Bell.
Question: What form of water played a part in Bell's home cooling system?

Title: Roman Republic.
Question: How many slave uprisings were there between the years of 135 BC and 71 BC?

Title: Greece.
Question:
What years did the Greco-Turkish war take place?