Title: Capacitor.
Question: Why is the value of C0 unattainable in reality?

Title: Umayyad Caliphate.
Question: What was the final year that the Umayyads held Narbonne?

Title: Brain.
Question: The two main structures that protect the brain are what?

Title: Han dynasty.
Question:
Who introduced new coinage in the year of 120 BC?