Title: Lighting.
Question: What is a basic concept of deciding how much illumination is required for a given task? 

Title: Arsenal F.C..
Question: What team defeated Arsenal in the finals of the Champions League in 2005-2006 season?

Title: Melbourne.
Question: How many domestic overnight visitors came to Melbourne during the year ending March 2014?

Title: Mary (mother of Jesus).
Question:
Who does the Islamic religion hold to be the One, Unique God?