Title: Windows 8.
Question: During it's launch how much was a Windows 8 upgrade?

Title: Hunter-gatherer.
Question: What type of hunter-gatherer has disappeared ?

Title: Muammar Gaddafi.
Question: What volume of The Green Book discussed democracy?

Title: Christian.
Question:
What is one of the first mentions of the term Christian in a non-religious work, referring to a tribe of Christians?