Title: Wood.
Question: What can we judge in wood just by looking at it?

Title: Umayyad Caliphate.
Question: Who defeated the Arabs at the Battle of Tours?

Title: Financial crisis of 2007%E2%80%9308.
Question: What did Nassim Nicholas Taleb make a fortune on by making a big financial bet?

Title: Age of Enlightenment.
Question:
Which six universities were the most renowned in northern Europe?