Title: Financial crisis of 2007%E2%80%9308.
Question: What was Timothy Geithner's position during the fall of 2008?

Title: Umayyad Caliphate.
Question: Along with Muawiyah, Abu Sufyan ibn Harb and Yazid ibn Abi Sufyan, what notable Muslim participated in the Battle of Yarmouk?

Title: Race (human categorization).
Question: What class of researchers surprisingly have no generally accepted concept of population?

Title: Sanskrit.
Question:
What is Sanskrit not  able to express?