Title: Uranium.
Question: How is depleted uranium used in missile re-entry vehicles?

Title: Seven Years%27 War.
Question: What was the major gain by Great Britain by having Austria as it ally?

Title: Age of Enlightenment.
Question: In what year was Descartes' Discourse on Method published?

Title: Renewable energy commercialization.
Question:
What is the most widely used form of renewable energy?