Title: Financial crisis of 2007%E2%80%9308.
Question: In what year did a group of computer scientists build a model for ratings produced by rating agencies that turned out to be accurate for what happened in 2006-2008?

Title: Anti-aircraft warfare.
Question: In addition to guns or missile launchers, what else comprises the battery?

Title: Chihuahua (state).
Question: The beginning of what ended the Porfiriato?

Title: Cyprus.
Question:
In what year did Cyprus join the European Union?