Title: Han dynasty.
Question: Who was able to describe the process of evaporation?

Title: Windows 8.
Question: How many pop up stores did Microsoft set up to help promote Windows 8?

Title: Myanmar.
Question: How long was the interval between the visits from the United States Secretary of State officials ?

Title: Cardinal (Catholicism).
Question:
In the College of Cardinals, the elected Dean needs the approval of who?