Title: Bird migration.
Question: Which birds did they use as a trial run?

Title: Royal Dutch Shell.
Question: How much oil per day does Shell produce?

Title: States of Germany.
Question: What does Gunlick remark that the German System of  dual federalism requires strong Länder to have other than the capacity to implement legislation?

Title: Capital punishment in the United States.
Question:
How many US states have passed laws outlawing the death penalty?