Title: Hydrogen.
Question: What form of hydrogen has been discussed as a ussage for fuel?

Title: Nutrition.
Question: The increase in cases of diabetes, obesity and heart disease can be traced back to an increase in the consumption of what product?

Title: Dwight D. Eisenhower.
Question: What American official notably opposed the armistice?

Title: Separation of church and state in the United States.
Question:
When was the centrality of the "separation" concept to the Religion Clauses of the Constitution made explicit?